Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6c874563451154…

MALICIOUS

PDF

71.3 KB Created: 2021-07-06 13:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: baee763df9e5cf375c8023596276a8a3 SHA-1: 11b3d8e03db35fb2597701508ef63bb523b26eb3 SHA-256: aa6c87456345115473ab1bd0f579cb0cb214717d1e6e4538a19c79ac39449207
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress installations, suggesting a tactic to distribute or mask malicious links. The PDF structure and embedded links are consistent with phishing or SEO poisoning campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed63a242e4---vinedakiponipu.pdf In PDF document text
    • http://homeopathyhongkong.org/files/zazuganugu.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/90960499478.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f8cf21b9---mefetokolasofozilujexot.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/18017971176.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/fikedifeledazefixuvebaku.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fef31cdf---zanaxobavoxijaliseki.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/3414757689.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117ac1f8ce---60038212989.pdfIn PDF document text
    • http://didopack.com/files/40643288799.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/jejixipesogowadilobi.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/gigibazejozivobilifituxo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/vokokatajanupipaf.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6pct66689q00294tanjir3gcq3/10989217718.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/puwuwuforipilurivutesofun.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210522062212150.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/s18kivsr4e715e6aj6plgufmvh/pebudulowevufefofi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8e9b091320b751a7cd7ad8b2ecfa02f5/binidirilunazugonekasiku.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/81788442131.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092530db1a8f---nimitizobovorulokoke.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46b5934e1192236547039783e04a96ae/21029271612.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/volalerobepugewevatukorom.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/090562b8a1eb4e7e1500395e0e42f52e/71883097605.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/dugoxiw.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608121ff34511---mavedixamizevezunu.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/sipatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=up+counter+vhdl+codePDF 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_off0000b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78B 15492 bytes
SHA-256: 474ccd99591a8293c1c7fd2b403db099030b7f6ab86bc6b1fb27c597903c8c6a
font_01_sfnt_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 10360 bytes
SHA-256: b172e02ce6419e6d0f57aee6c887f7e55c514e176f2358ad3f02bc1db752cf42
font_02_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1