Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc6d4e1f1d38e52…

MALICIOUS

PDF

76.8 KB Created: 2021-07-21 14:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 59a31553b7e6792cb7bd681decdd7675 SHA-1: d44a2357b2fc00e65921aa1ff4be6dee68e52568 SHA-256: 0dc6d4e1f1d38e523501eeb5478adc8c3cd44fece45b01bcd92b99fa0c197d74
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to other PDF files hosted on compromised WordPress sites and disposable hosting. This suggests a phishing or SEO poisoning campaign, likely distributing further malicious content or leading users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca558f3969---xibotolomivaxodik.pdf In PDF document text
    • http://conelser.hu/fck_uploads/file/zaxazagolovotedimu.pdfIn PDF document text
    • http://texmet.pl/userimages/file/vaziv.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60D0485FB9F31.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a9af680856332ce469a9bc2bcde1093e/pulezigivasibu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/7be3234924acc1cd1d8b213aa738fa49/domelu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i017ugch136kldinpbeskebad7/56230089923.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6092d9da---dafoxa.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/jiruwezofu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/lm6975qa0oelioe5vo0iseqqmo/weforezov.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f66526e8---fiveleminogivume.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607de14ea67f1---rurosewivumelumexejapu.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/savoxur.pdfIn PDF document text
    • https://fultoys.com/userfiles/65416407101.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/wupowogikal.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c03c010f8233a2ff1c5d716a8af7b087/22149948596.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/vogigazagodi.pdfIn PDF document text
    • http://mextro.de/upload/files/joxizirug.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/c50s0saa18r0np0nm1l3c1e1up/89430997803.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/mubunifevininavepamojuk.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/gofedizotusebix.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6j3vjj72muufbr18i2qrqlmj83/fivopuzopi.pdfIn PDF document text
    • https://alternatifhosting.com/calisma2/files/uploads/23413798824.pdfIn PDF document text
    • https://ecoretras.com/file/woxesafutapezeputij.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3eab981ff8c2b86c9b265a3c344fcfc1/60215462149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vhdl+code+for+3+to+8+decoder+with+enablePDF 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_off0000c8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FD 10980 bytes
SHA-256: 6ba4d22fd503f276c49615dc5940bd34e17e11d3496e40fa5f6a3f881489fe8e
font_01_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 16008 bytes
SHA-256: 20603d78194d6eb9cdd35a82ed4cb0a874ba82235118e8234a8e47a7e691368b