Malicious PDF — malware analysis report

Static analysis result for SHA-256 a826a6163a1f8122…

MALICIOUS

PDF

95.4 KB Created: 2021-08-23 09:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c9462ba1dea3ab9c98890d138c8f9b1 SHA-1: 17a94cf50d8d7212a1a5c6ecff35417963d5d66d SHA-256: a826a6163a1f812210ccae40a4fe0c052ec71164e855d20d1a97d9aa8a062bd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=frp+bypass+tool+for+pc+free PDF link annotation
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/98bf61ef305c68a44306fc93f11b13fe/doxoxipa.pdfIn PDF document text
    • http://attlas.center/userfiles/file/55099442561.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/37896580904.pdfIn PDF document text
    • https://manenshop.com/upload/files/fofaxurotukefamatida.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4m9dauagruidh3df1eeimteu77/49520716300.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0208f6f338---memojigireruvuwotetenasi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6a1471f1---natidubiruw.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/31519888881.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9899d8427---68956160399.pdfIn PDF document text
    • http://winso.tw/userfiles/file/12854274126.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/25822782278.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/53670937924.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fojapopebe.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1629280376.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/34934538130.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/senejeviwarijowa.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989202ebcee---fugixejuvurubon.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ab9e2284fe3d540a2a2a55308a22e0b3/sosodedidubowinesapepad.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/kkg9b71hp77t1064b96oc368m4/93465257797.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ba60c82473---lidukixawusutufosut.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0cbabadb7---katedumewiwix.pdfIn PDF document text
    • http://asustainable.com/global/file/33617278370.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/84419625879.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/86543377400.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_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10508 bytes
SHA-256: 7eedbddefc7f21d9d9e47bedb8cf688422eb72d49fa3dbeebf08d2c88bd675c8
font_01_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14179 17500 bytes
SHA-256: 0dc884162ce789fc71444f9e201361648daa5c2585a1d14b4410d08bcc950270

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