Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fa3a142a6ec018…

MALICIOUS

PDF

90.9 KB Created: 2021-09-04 15:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 292139e0f51390a8faedb040750679b3 SHA-1: 1daefef0e3458ca7828d6c1c474f8735b5dcb8d8 SHA-256: e2fa3a142a6ec018fb5ec3a53520aaee6a9d90d28ae15a3090e2d270297b74bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external URIs and the 'link farm' heuristic strongly suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=quantum+mechanics+a+textbook+for+undergraduates+pdf PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf670a1234---88346248494.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/45022099788.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/fcca4746d80445bb729eaa917c4ac127.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/942c9s4d5pjh7cdfn58gbir2rk/69497249757.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/99806233074.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe589b6110---14989926338.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/pujijomiz.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a5fdd6132---14233985243.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108241119079777.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6b83b9c7---51768315157.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/06/files/210630161956.pdfIn PDF document text
    • https://mmszke.hu/files/file/45799788557.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f309b725---41680112259.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/fulewitakatabekobeduduba.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6af345296---remawilogisozofozowa.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d0a648610e4f3b2559ec6d57cbfdea99/bizabadonizutusalefu.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/48418417182.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/mowojokagalekoxavo.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/fojasogasurowabefawabake.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/77122945132.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6e2cb8172b276ade6315ba7fd731d06c/22933362061.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/643b892c9e64c23f4d9e0d4a010a9a1f/xitijoxupato.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3b5f3bd437bbb29d57f01ffd4d28682a/pinumogakutakupawirazesut.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_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 19668 bytes
SHA-256: 3d8c61f4cc63ca18f7b2898dc5e73f11cb798c72698d21ab6eea3872484e6913
font_02_sfnt_off0001428e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428E 11516 bytes
SHA-256: 90764c76ff1e0621f4d244eee4a10db2a81bb02fcf8267ee1b7a6f1c7a911429

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