Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d685f2dccc60ab…

MALICIOUS

PDF

108.1 KB Created: 2021-07-04 18:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1e041f9cd654969701b6ce1d78c661bc SHA-1: db9b70117973abc1073b36be0aee3d46dd9ad627 SHA-256: a8d685f2dccc60ab212d97dd8af7145c63ff08c7d0712984ae72a051951eb155
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/60ab1c85733a87db83b7300d2976d50c/21055130562.pdf In PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/79813371141.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2efe7a9fd---48523637928.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc94ea0a55de5082e26d7d0c5cbdf7e1/73629415262.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d93d9235022e7f0fe5454378833c2874/juweluj.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/71961457231.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/36150284987.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079468c42ff2---79115273844.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/73016556723.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/382665b47d9fbaa7d85a57b0cd9d83e0/57068747436.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c0e0ab37138da92f99e66a689cb47cd1/62285655817.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/rajumiwemipofi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86ef403d4---8562216906.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fbf814791---31893642081.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/97c4d866423587ac216c59c6d5e99dda/5291400748.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0d8102bd---mogamibujo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6c68a3945bbf1c97460ad85746f6f564/zuxuvifebovun.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/telogepibilusapudarulavuv.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4cc092ef8c5ef24fda6fb6d4bf5bf386/88713640589.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/wijumepimof.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b981cc97d---39745285231.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accdbd88f26---40655814127.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b0165380ae1dbdae904a44eceb9feb56/26922065291.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/92988909305.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/058fb124e66b8a15cdfe2459bbcc36d2/69758238475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+state+of+nature+thomas+hobbesPDF 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_off0001461e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461E 17308 bytes
SHA-256: c553be4967373c52c51d4b6d6d5d52ca454b527c392c1ecfc242df29793f5954
font_01_sfnt_off00017321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17321 10544 bytes
SHA-256: a53ff4f2c8beffee558c7911b2a39925fc12fa4f9a58999ec900aa90201eac08
font_02_sfnt_off00018b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1