Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e8e3ae862f5fd4…

MALICIOUS

PDF

108.3 KB Created: 2021-06-28 05:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 893f388b1714a8cc8e259935419b76a9 SHA-1: 1f04f831dbed0d7d351df208af1c1a9648ae78ec SHA-256: 94e8e3ae862f5fd406cd9d0ea58c354dc2c455ca4e9fd18b23eda2db648688f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://huntic.ru/uplcv?utm_term=truncate+table+foreign+key+constraint
    • http://allprintusa.com/admin/images/file/17313474146.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ecc790ca6---memibajepanilovunirobo.pdf
    • https://loctra.net/userfiles/file/gebugujisadaxeparaga.pdf
    • http://chineseclothingonline.net/File/saxaxukeb.pdf
    • http://traiteur-ribot.fr/userfiles/file/budurofug.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50ea820f3---39024007845.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/70500835955.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/7360b77c27a23b29ec8df6fa3bd69910/lubekafixuvavup.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf9761dbe---21686343445.pdf
    • https://247hvac.ca/fabulous1/uploads/files/92467361133.pdf
    • http://bahattinburyan.com/userfiles/file/30968664905.pdf
    • http://crmrealty360degree.in/userfiles/file/864968036.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4vaj7rgo1nvvvte6fnq9b8ocig/21217838774.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f2f40f3c155b7fe3716b344a6c79bf50/72314464461.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1ae9ji4062bua6dogj5n844nv0/16679734655.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2744bf10f---puwexuxojokuwedolewisekif.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f4098fb4f9410e0dcbe680d763350ca0/58948434921.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/290045c237cc25de20ab5d0bf230e362/94184962709.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14a84dda3---97849301702.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f676be61---podebezedokote.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/49f3e716f00583dfe690521a8817c129/lodufejunuziwez.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56691a1bcb---jogevezimofukajilusuza.pdf
    • http://sacoorhealth.pt/site/upload/file/kogesabugeborol.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tacjolkq1rr69gr20t4garlmj/34571486309.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138aa.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 1636 bytes
font_01_sfnt_off0001407c.bin
de43dbfb127568518ab484573b94d7be7633954b9150a3007666d2ba0fd617f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1407C 10920 bytes
font_02_sfnt_off000159f6.bin
65bc132be9037c93a889623ce01160f8ea2f638438b6c46fae3e36b4c73d2946
pdf-font-stream PDF embedded font (sfnt) at offset 0x159F6 18396 bytes
font_03_sfnt_off00018b0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B0C 16792 bytes