Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2152c3a8a0f706…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 14:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4fabd098e0502ea6b62e12bd0bed48c SHA-1: 18446f6d4e1c9989730c6c3e97447a47fe05ef84 SHA-256: 2c2152c3a8a0f706cd842dc2ab48d6ebfb039637937d01c3df9981f72658e795
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document that exhibits multiple indicators of malicious intent, including links to compromised CMS uploads and disposable hosting, and a high ML classifier score. The document explicitly instructs the user to disable security software, a strong indicator of malicious activity. Although no scripts were extracted, the presence of embedded URLs and the overall heuristic firings suggest the document is designed to lure the user into downloading a secondary payload, likely a Trojan as detected by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=fire+pro+wrestling+pc+download PDF link annotation
    • http://studioingegneriavaragnolo.com/userfiles/files/20488161835.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wowupugajoponetebupama.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095fdc8329fd---lawafuvir.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/turutujase.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/tu85mi2pq08jsffnttsoir9bg2/sodakufo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607225e6c8aa0---79951259207.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a29399846d2---silobuxiranenanuvifog.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/19335737157.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/didh0h2s7vpb6bd9bpbb6a14mo/62614003137.pdfIn PDF document text
    • https://medtek.vn/storage/file/lelujabuxadekevokudubovu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8cu1hs6q3kjhtqcfgk10ssn376/83537793816.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc33a782d2---tawekorugojotevanaxa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c99a9bbc---59638400319.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be4c53d35---92800296947.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/mizebifenowod.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/72916689698.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/nujetoviwemefuzojoroponud.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/56891182962.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c792ab2741---9362013930.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/53775423285.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tldka1no9p05ol3ddh0gs8uumb/12871450540.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/tefigozutigavevok.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba89b9f4c---zoperakosefuzazulezule.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa125f3b339---85885379430.pdfIn PDF document text
    • http://zatacorp.com/upload/files/fafefibozasudipivogo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 10752 bytes
SHA-256: 021b5d8bb483914fc6641840027928e9179f4e73766a4b93890a1f1ab8709c3f
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 17416 bytes
SHA-256: 21af5c2df9cd6b86ce52bbf717ff7f80c2468ef33238fc4fb60a06f76c07ca23

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