Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f434c89d41ffb94…

MALICIOUS

PDF

117.8 KB Created: 2021-07-04 21:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 277cdf0da08e0160d81ae58c7b1b9aad SHA-1: 5689ce4decf72e740d3ed8bf90f2c6dc4da7a15d SHA-256: 0f434c89d41ffb94be42653462e613a6df12e347abf24df839e714fcaed58c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads, and ML classifiers also identified it as malicious. The presence of numerous URLs hosted on potentially compromised WordPress sites suggests a phishing or redirection scheme. While no scripts were extracted, the structure and URL patterns are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4cda315ea1c8e8ef051ea46cfe030a69/gevivesarinamuso.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ddc79ed3---tofinorawijinan.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091349abd399---7411284640.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/81483608110.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b17221627b7---51349716106.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bf367d027644d0e97dfa4dd1ed3673c0/89710333252.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/gemamugojiduminob.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52157807f023619b8a93d611c4cb2738/46268497156.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d9d372e72fb505d7bcdcb74c97651427/razazefilijifobum.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/34c9618dd6df2a12d24415921ba5f995/67809479039.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3d62878c6---kejuli.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/fufobusevulixaxep.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607311333514c---53033829737.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/azazewatamowukiposiresop.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/14860015610.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/lesixuruvo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb10b4cbdf3---lerog.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f45d0d8---zokedalilojazizuf.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/41515117156.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608147710d3cd---robamivu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c988ed18c0c---18103168734.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wajajesubosamipas.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9858847b225bbdc0bd08fb17083ebfc5/32786807891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cast+of+shake+it+up+indiaPDF 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_off00016cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDE 10672 bytes
SHA-256: cf5e61de2633d26c29acf485cfd2b153131fbcd74c656e7437a3c1cde5d3cafb
font_01_sfnt_off0001854e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1854E 17232 bytes
SHA-256: 12df6691d8766446870acb61a2f3f53308870e74414d51e38e6289c04bd762a4
font_02_sfnt_off0001b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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