Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf194dcc973ef5e9…

MALICIOUS

PDF

152.2 KB Created: 2021-08-02 06:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 145e52f2f1d08b43fdd56d5e0ba2c0a9 SHA-1: d033997132aacc7eafb97f775f8643db2b83bd43 SHA-256: cf194dcc973ef5e95731aa34211fe0c612664b48c34f95f2a38505cb7ce1b351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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://garglob.ru/uplcv?utm_term=all+i+want+for+christmas+is+you+soulja+boy+remix+lyrics PDF link annotation
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tizaraket.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/50517302802.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kejasanekefitelexipup.pdfIn PDF document text
    • https://aspirans.com/files/file/bidofazufoxazefomiv.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/57b0bee4a8e3df35ae8cad8f785c0d5d/zixote.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/gaverawejale.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/88a8e2daece72276ab4fafc1e8eff6ac/bovadapijanibixupexaf.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/36df2ba2324b3a0864f9fd138ac46ddb/85159366838.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9a78b24e---xusegusasol.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//63468240758.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73c5ff73d0ef44606550ff3412e4f598/98508934881.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/33261891242.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884c4447a9---24802443284.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/zazisaketidenu.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/lukobotobozikogemoso.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/2099307617.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/65184935836.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/94412119552.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/nagowaroma.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qjrek8185uodm0ojnptm8bcl25/13865700932.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7188fa0326---nitazabubitevate.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dpbf0lujpqrvsop8omjc3tt1k4/45390467586.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/oq4ekkkhhoid3r714u1672j0qn/55137269488.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4plnbsupjva0b2rtofotom496k/38541066762.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/gazoxosarevuxanowoti.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D66C 11256 bytes
SHA-256: 62d8299d9ac21d329226732e24a9ba02900d7e045e8a095d68415909f6323216
font_01_sfnt_off0001f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000208ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208CE 3748 bytes
SHA-256: c407845426a5ff41da1a6b6c4e82432d2101c9f85a0fbddb027c5b4d8151eb04
font_03_sfnt_off00021781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21781 22424 bytes
SHA-256: 8334dfdf46a6b3f11fba7646ca4090c4f1bea1c26ea5d7cabb3c7f95e5dd6bcf