Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8d081d57f320c5…

MALICIOUS

PDF

97.1 KB Created: 2021-07-30 06:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c5923b550c20e61424abac04bcf4ef1c SHA-1: 0e712bc83f244b130130735b3a8097f124c08561 SHA-256: 0c8d081d57f320c5a03bb198bc5ea9d95caf9cd379742051fe02f6fa86acd808
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9dced393d20c3cc1629564c5f792f297/zidajewadinupulu.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fc581be8cb9f97b41248cd737c155ebf/fixub.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/jolibitasetitogu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/j5ov44o35vl3vjkto87o0286h6/genijigifowuwodoxomur.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052116571837.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/bemanov.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16091656c991b5---napuxategenafir.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/69865893426.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/74822288164.pdfIn PDF document text
    • http://waypl.pl/upload/File/jelaxifezijebusizok.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d117ba08d231b470a1454a304baaaf86/40371974241.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/25341172520.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9bc07a1d---xuvegimaridejegasesoki.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/9bf235529726b1b9b33ab632af04dbc6/tevevivepozunobutoparado.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/fasazesudujususez.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/90446871332.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/vopofesu.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/bikuvopagito.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/df1034390cb8878b86e3a0af412f9861/wesekawopogosuzirupekuw.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/a8813972e0e6687dd34fee8ca9b795bf/37375045.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/litodofamirebu.pdfIn PDF document text
    • http://megalaserasia.com/upload///pemalipeva.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef562fef8---75883082512.pdfIn PDF document text
    • https://petikdaun.com/contents//files/lowujofati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=contoh+soal+simple+past+tense+vs+present+perfect+tensePDF 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_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 10844 bytes
SHA-256: 187f1f4b543283f80395f2dc2d21b1e7f2745e30a7146c59588880f02d07f704
font_01_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 18636 bytes
SHA-256: 024e3e22ce38b3702c8cbcd3c4050c097a38415b16737aa839fe64e413d178ae
font_02_sfnt_off00015b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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