Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d597f3a24d9b99…

MALICIOUS

PDF

112.7 KB Created: 2021-06-11 09:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 97ede44234e952f959db3ab5f53f90c1 SHA-1: 09b5a6b149008dbac4d07bfd74534c5e90eb0a3f SHA-256: 91d597f3a24d9b99500ffe0fc3044403924702c2c64a3d71a2ab57bc05e1c861
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=rabbids+go+home+wii+iso PDF link annotation
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a856514e0a6---95118559040.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608639de2cd40---13302329172.pdfIn PDF document text
    • https://isosklo.cz./uploads/87185949275.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ad827efcb24f68787f643a9e599a8954/31308504600.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c47b019f9c20d748b763b930159d986a/levexidapoduwitetukab.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/bimokolalofipipaponadogu.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file/%5C/fokuw.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/tosuxabexujawuzinosisefe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/420536e495951d818e1d709ff566bdb2/majugatabimajajanazarisis.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160898a3e744f7---ririfik.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0faf189b096a07599cbeff1fbecb93da/78513178265.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/b50a98ca38dc866fad2edd8d9a134020/gikisavike.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc35e4ec374---32142948324.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3090a2379caacccf3b3a01ad5812e607/70196023394.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68056aeb0---fuwejaladobuxesifolufexu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sejonudogozusu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0672483001620359744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e16a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE16A 50560 bytes
SHA-256: 4babf6b76ec31944a8e788bf76e0f8e41a66f160617e478524e0492ff5843383
font_01_sfnt_off00017774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17774 5352 bytes
SHA-256: 86c062cf8a826afc23c53aa2133784943b5006f0a3c245d535d42d953156cb41
font_02_sfnt_off00018996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18996 13672 bytes
SHA-256: 669e1cb3c572aa9ad842cf5f67a76df7e7f2f7e16a27a3a3a7cc990100cdeee0