Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3331ef10c638db0…

MALICIOUS

PDF

96.1 KB Created: 2021-07-02 03:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 706b2ff66ee64fe12c58555b7c457298 SHA-1: 400ed7af421ee4d6a9794aac87c075ba2c8e157a SHA-256: a3331ef10c638db0c8c2b6d827a17990b1d7a4ad9fb3878b24c3ac52c2a437cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wojuzumurakowun.pdf In PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61d4cbdb0---kofobofinosifovifimaxit.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/guxezedegamujopewavepak.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/fmllcl5tpj9gdmhatp4o317822/22846622184.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/45f39b7bd9c0af7994fee313d53622d8/xobagarisuwonekitewag.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ff3427eb---48398672426.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ac119c0ba1421873b121ff1502ac5fb8/latopibebaxum.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/6b6718c1d6f1fc1fc35f039564c6a5f7/26900344107.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/42227729284.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/1422d78ed9a68d56c233521c6a0a69d6/66486248222.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/ridapanakupevijuxasusew.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/tatefoxu.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/tiwufin.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/rufezitevadibimamokina.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0c19b61e2cbb0412d30245702e06fe8b/51224855189.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/12498638028.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/69171235739.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/eebc44ba972697b9cb911a02ee4c6498/33168558581.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/q8l35vr9pvj07e4ogp82aa6kku/gemixazimosijawi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7va8u7u1ag7asrc5svhl2aktf0/lijifudevefefuwow.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/e512ed221b8ce77823bcce5b667fcd1c/didefegidedavetepevo.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/178553378.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d87539d96---damek.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/vavipudobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wear+abouts+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10636 bytes
SHA-256: 6c10d2ebd01db24bf1f11dde95de70947138029379730022f281e887dc82ba39
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 16632 bytes
SHA-256: 6532e1085aa277a7451b6ce327da272d1514a1942496caa3f280a87eea86d260
font_03_sfnt_off000144bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 17580 bytes
SHA-256: 2ef6835f97a38d0932d52640f61f283d610be9c98fe4438b702c1225aa279a84

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