Malicious PDF — malware analysis report

Static analysis result for SHA-256 948c5ed12089cfa7…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 23:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aa9748478264bdc1fa5a4d272c290027 SHA-1: 7ae086bdb7794d0e86d2623fb8a88eff1bcaacb7 SHA-256: 948c5ed12089cfa7173313c6c6ec134b69bea0af2a3f4dee90bbd5a666e1a849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=starch+in+human+body PDF link annotation
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/dad7945f4683d90cdb90bc60d1861211/84088094734.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c912545c7c---14360778094.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160837262c82f9---kosutesetatisasugewukar.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/85010259551.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/lozadut.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077d29be4a87---kofinolifebiwoxig.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1quhk96lbriclu22eo31im8tsg/tiwixevojorezo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608321cb9202b---kumiwuwewiboramefodipumif.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/momg3b76df5buds2oq8f61gprg/50156857957.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863a163f1b6---nonejobo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e8efa8b1eddca9fe101e21b5fb942f78/48223601299.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/b3194g5cfki73vjjdbgb9jcrvl/83240191061.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/46d30edca00eca4c7b03c7f48e891c12/gepuzajugoremobaja.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3b385ab1089fa8b37272891fb6dc329b/57015665152.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a41f9f667---60843075316.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f7e66fe5d50666e88c76efc05fae461d/madel.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/xonina.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mizulofanutugavisasudukij.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5e538d3cdc11957104aabef9e5a88eff/posasotalegos.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/gbn5nrnt4374ccnakuugtpbmn3/28974479871.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1bd95323---nuwexebed.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/71730486904.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/786ada24844e154e6ef03f282968e73c/numiladomivub.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/73bf741eed2dfce88b3011797bf4d759/vulivanifo.pdfIn PDF document text
    • https://codecs.roimages/file/bakaxoguzajujabunixa.pdfIn PDF document text
    • 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_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 17152 bytes
SHA-256: 2d94226a98c18989836f31132dc731d4551b44f722b88147323880f6d98a15e7
font_01_sfnt_off00011967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11967 10720 bytes
SHA-256: fe0dea4688ecb3c7b3e2bfa388519bdc38dbf9397cb3cbbe286cebb7a187174e
font_02_sfnt_off000131d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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