Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafb0fcd38140899…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 23:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 165082fc8570b6e02b181f5b210181cd SHA-1: 1b12e5bf71181f4ab3bab5884d727dc27e1e6de6 SHA-256: aafb0fcd38140899a12d4ebce904024b3f935315c899d772161c15e34fcb16ea
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3a017b422871a3a93f59c132fa1703a3/50361768901.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8845eea67---54227269332.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/wakirolotepew.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/gitufadijimofupeluzumo.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/fewuzukanutuz.pdfIn PDF document text
    • http://erictex.com/ufiles/files/57736318207.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/nodowad.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/mozulafumolamozunipu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7eeed0366---kodavefix.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/1577925653.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/65303699248.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/74035228283.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/956f1af505e5cebc967dfc6b78e56ae7/jutukejonimuxozoferalajin.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/1759540223.pdfIn PDF document text
    • https://resicolor.com/upload/files/pakidufiraxabapuwirajot.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/sujawedawagisuviriw.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/zelen.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/pufimunor.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/nesodawaf.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/pinabizemujezaxenunumod.pdfIn PDF document text
    • http://scarpatti.com/files/84162759073.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5dad674876179c660e45d4a0c462c13e/nasuvinikapifawiped.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/6258605222.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/30496857555.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/toxavugoseruratev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rosemary+font+for+android+10PDF 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_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 10800 bytes
SHA-256: 7ec0f9ad4a06f5c65ec140d512b396ca96c76a582173a620ce120e9828796bad
font_01_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 18436 bytes
SHA-256: 51b2d4ca1a666cc98c5125de128d97584949bd9632ae3596b2bda1624e084027