Malicious PDF — malware analysis report

Static analysis result for SHA-256 0708cec3853c3b25…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 17:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2d2861ab52abe2e501c0b95644d5a66 SHA-1: aea11cf810611d893e6aaa7c0881bd87d8bb6f3b SHA-256: 0708cec3853c3b2584cee5717905af15094daadb6d5730fa1aabf559c594a317
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The PDF's structure and embedded links suggest it is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c334133571b---74630301580.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf610b4ec0a---misowejakojomuzuti.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fc6de11d9897dd9d6e05c330060d3469/gejotudojanamugaxosad.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/fazipilusojuwu.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7085763931.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4aac64e0a---vipod.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/51700551411.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8af5a2983---67157667598.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/13313156647.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/32169724161.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/guluzuja.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f371daee5b---bedijezu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31ad40c5a---mawifibates.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed7526535---nosexobazefevag.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9prj4kbvs6smll4ov7kp0qhrh7/44952461875.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26145ce51---susimamuzijomilozenomexe.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3dut4g6a4jutlp4t0iudjok5vj/kagefi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-24/20210624005848210308.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/66968127913.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/94217df40ffde6aea4607d541ed491ea/didewuwaletetaw.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8a72c0aec8dca9ac016eb1ac1f67965c/97949688691.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/mdlkefqu76kjce38me2rq8se22/topenupotogurupuv.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/de78c67f2e7610691467082c0c52844a/42060025970.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a44310e---feguju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ncert+solutions+class+10+maths+probability+optional+exercisePDF 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_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 11248 bytes
SHA-256: afeb3b020ebd48403add96cfd261ef3e3d2f79f07cda7ce43d481b47b5eb51ec
font_01_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 17136 bytes
SHA-256: a612e65f7b2ef280bd339f2e65a9d392f6293f98b151ac1cdc9feddcfddd8f4d
font_02_sfnt_off00013e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1