Malicious PDF — malware analysis report

Static analysis result for SHA-256 700b25b63342ae9f…

MALICIOUS

PDF

80.7 KB Created: 2021-08-04 23:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07fac0bed81065f854011720d95fab1d SHA-1: dd76f284bb900413706e66c4d64d2d2081b8ceb9 SHA-256: 700b25b63342ae9f77b88a60335a27fad942c5067c558536aaddcf79f46de603
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://goez1.com/10005001208290177/ckfinder/userfiles/files/17672391970.pdf In PDF document text
    • http://area100impianti.it/userfiles/files/20869610521.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4c44c726ee092efa74c0b9d6ef0b2639/lanenifipujixefek.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/pubuvolad.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/34987464074.pdfIn PDF document text
    • http://93564497.com/userfiles/73830420374.pdfIn PDF document text
    • http://stroi-sistema.ru/img/93499924147.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/14664588441.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06bb45d718---17862974818.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/62759027525.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/jotamomiramoj.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/3075344803.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hdrcg6ddccmr1vbru87obh6144/zubosotupikawatewi.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfa77c79b---17926669511.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/95952924959.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///12630848061.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ef9443d0b094e7ced6d9dc1a9dbcf22f/17235041107.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///resabasosakiwepef.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989e944e3a7---79846500288.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d7f8045a8---99468652446.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/waxubujeladesikux.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/ginesovenedoxadibixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pro+guitar+tuner+2.2+5+premium+apkPDF 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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 16872 bytes
SHA-256: 65f969192c3cc92d80773090ea1cc0972571166531560d4632c3ee81ab391642
font_02_sfnt_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 10896 bytes
SHA-256: 7c07036aa3ad78c923b72715120028bd40a275a358e3d3d36f0dbd4309d3b6c6

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