Malicious PDF — malware analysis report

Static analysis result for SHA-256 682d3aa7696caa92…

MALICIOUS

PDF

65.3 KB Created: 2021-06-18 19:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1feced35acfebe911131b3995fa1c92a SHA-1: 97ffb0b11a27a5c80445aa66bb47e418cccd3310 SHA-256: 682d3aa7696caa92ea0a01ddbbcb6ea2d306cbe8a0462b3a9cdb3bd114f14a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with multiple URLs pointing to disposable hosting and compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of these links strongly supports the attack pattern of directing users to external, potentially harmful sites.

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 http://meruzhankhachatryan.com/app/webroot/files/file/finifixoxasimulilal.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c25baafd0---pojuripalotorawepugimupud.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca597dfd06---69053480839.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ea043421abaf8f1121ba4fbbce1b14e6/fubuwa.pdfIn PDF document text
    • http://feast.to/upd_file/kikatir.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5c71c66dff35c91da31dec6a0d75847/33348577089.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce772c772d---lupuximadugon.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/nozeradik.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bec2d94d3---wikemawaberifikuz.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ep89bhu0q6a3kqait48b3p6ti1/jogiwa.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wuxumunodoruten.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4e2252f6923dc7abbd15b1fccecbb2db/54643288527.pdfIn PDF document text
    • http://www.heksan.com.pl/file/jumozuvirawowew.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/33692367412.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ees3iq7c9eqejhhu6d2epdvkaf/18255177821.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/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=aasman+mein+badal+ho+rahe+hain+dheere+dheere+pagal+ho+rahe+hainPDF 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_off0000bffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFB 5504 bytes
SHA-256: 4ea0c25bf607482c59c41efaf4f5aa5ebf7e9bb700c932a9065fa0198a35d323
font_01_sfnt_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 10948 bytes
SHA-256: dbbb91e07137e6be137ff5f30efd26d9446714f21d76666346b962aa22fdec1d