Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ea4dcd8147d40…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 01:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 218f7961106443c4d1a0c9fb785f9b82 SHA-1: e00897a5d8993277da8e2759315b9e1fd3a3d807 SHA-256: b72ea4dcd8147d406e9d7691be393709f21d3fedf22d768f46267ede441e48aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were extracted, the heuristic firings indicate the document's primary function is to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://studiotecnicolamanna.com/userfiles/files/petez.pdf In PDF document text
    • https://wojczak.pl/userfiles/file/xejudiluxumepolazujizogam.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/zanetumod.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/tojeduzivapekev.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d9122aed---jowefepabomagomumaxofaxun.pdfIn PDF document text
    • https://ijpdua.com/contents/files/bevix.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/bejajerewuxozukur.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381fbcefa93---57280724221.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fc90a945fd8fb65c42961b0c1fa08115/81860299065.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/98616869571.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kewakipejes.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vogomonisabebideve.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/jujefe.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/77652331395.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b62e7404f---fisijalonugeza.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/xofiruka.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161475789bbaf3---48627352724.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/pazisijekixiberasupuwegu.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/mesefudoxexokovipibizanu.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/zazav.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/19595506458.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/43769932935.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/31016166825.pdfIn PDF document text
    • https://samowar.me/upload/file/77797142548.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/85652120085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=army+of+the+dead+movie+onlinePDF 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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 17852 bytes
SHA-256: 9c7a63a645dfd67fff685cda293fd4d5ae913ab6ffbe74bb786ba49e4f727661
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 10612 bytes
SHA-256: 80b360dc3a069fe46769a2c4b30ec83020e954da2f01fa0cfb08765c1b31bfb9

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