Malicious PDF — malware analysis report

Static analysis result for SHA-256 7251a6803bffd82e…

MALICIOUS

PDF

216.4 KB Created: 2021-06-21 06:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5d9e4be86e9fdf426022d8bcfad38969 SHA-1: 46c7cfca51362eaec3dc502135f2af87e57a8176 SHA-256: 7251a6803bffd82e79c7f5347cf29cbab2b969af74a28a509a6ae85ab7cc223f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. The presence of numerous external URIs and compromised CMS upload links indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://signexpowholesale.com/project-new/christianbook/upload_images/file/93109000986.pdf In PDF document text
    • https://ecoretras.com/file/pimulegixa.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0c1eb599---16505071852.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084850f75893---40251270816.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/63674803645.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d3b19b879---97989157056.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/96942421429.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0387d33bc405631befc6ee21c7a9a167/seduweja.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad108f306c0---kikenikodisafup.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/jugipijoduranewixolobota.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d8glcmgblsdf4ivmnk3h5dl13f/pekefavedaxoderej.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/t4go6if1f2jv3cuv98h5561jb5/98260312972.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b83cd4c3dc---45235887688.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/fufiwowumifeboj.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef71c986dc---17409380796.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/37056120469.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/020f725d6894ba7aa9abb3f397089579/1590665493.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sibaxiweperefuxa.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/12575305401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lego+jurassic+world+hammond+creation+lab+codesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000315f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315F3 5604 bytes
SHA-256: 91b7661f4f71b016d383efc5e487255893ab4a664ec4ef238c92a099dc562397
font_01_sfnt_off000328e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x328E6 11804 bytes
SHA-256: e61c0a3240330af9b02bd8c927d41a3ea5f4fb33f8f6dad8d73a7dd7eb969dbc