Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16c13156c151a17…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 20:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7a457fb71e9d7cd051a9ac8be4f7ec20 SHA-1: 8f05af34dff64770a10445c1078716098469382f SHA-256: a16c13156c151a17d301fb08575fb5f92ab5a5b55a7dbae5f5f1996c28de8451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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.
  • 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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2be84271356801b23cfb39127f7e358a/novesufedemawunitof.pdf In PDF document text
    • http://ipceurope.com/assets/file/12737923669.pdfIn PDF document text
    • https://steammining.com/userfiles/file/25654858318.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/14095164294.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f850d52de1---fupudegu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/totiwewo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63b04cf1d---3354877888.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/petitagupivekufagewuzisuw.pdfIn PDF document text
    • https://angkalaris.com/contents//files/79917881941.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef1f927f6---mobogowowomebaji.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fc44439ad7f---28578507049.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608145b816d2f---76800376695.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdcf5f6aa---vanufapezazemidoviniwe.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37f0e6bfbe---nemowagudod.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/rixoxapi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/26495463012.pdfIn PDF document text
    • https://micsys.in/userfiles/file/xorebubevokasumetubokiwuz.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fogawirixaja.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/milemalosilotusiwawe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a71af45bfaf9f382c2ebfa1831bd6e39/ziwup.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i6vr2l2c5i812s16nku2uu4g38/13200929507.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/94454383537.pdfIn PDF document text
    • https://mojer.bg/files/8218872623.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/rixupibuvafeteke.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/ronejusapupidububi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+do+gypsy+moth+caterpillars+look+likePDF link annotation
    • 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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16612 bytes
SHA-256: 17869e83a8af0305049287106f4276f79bedad3dd6decc4023646c93f0ab32d2
font_01_sfnt_off00012436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 11056 bytes
SHA-256: 14f228f36c7d0785e4e6e731feb9980d968f4f388c970ae3751121fc67d4d1a1
font_02_sfnt_off00013dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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