Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ddc80b65ee91fb…

MALICIOUS

PDF

55.3 KB Created: 2021-06-03 00:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c66d9910a6903406c7013615f917a79f SHA-1: 4da10ea99789fb5230cf896a522530af9e530ef6 SHA-256: b0ddc80b65ee91fb34913e8f76ed71782d5943f4c535157ef9fe870a8fc1ebd7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites and disposable hosting, likely serving as a lure for users to download further malicious content. The embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive content, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://laborke.ru/uplcv?utm_term=formato+comprobante+de+egreso+minerva+para+imprimir
    • https://audit-advisers.com/userfiles/file/nuduguwu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a45210e87ae486b8e2946f886621eb00/71328493665.pdf
    • http://burchiellati.com./file_fck/file/58555516224.pdf
    • http://apgindia.in/uploads/file/%5C/nolafigiga.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6fefb4ac34afb3eb38f439442ea3411f/kigedegojurimakuwezew.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/96d489c86746c42444743f2e7cd86ca1/zupuwitavokemisufug.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fe7e6576d85ef4a8cdcafad552fd2342/2719425343.pdf
    • http://poorclarescork.ie/images/90509225706.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607789abed6f8---dumoreviliru.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e924375782675464e8e7d2e99b500114/70678814766.pdf
    • http://aarogyamedico.com/userfiles/file/76889238218.pdf
    • http://anma.pl/anma_edytor/file/wemanino.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092982d215c8---75034177059.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bf1578fb---lorapanuduluki.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6oq85slq8v5g53qtldsgdq54c3/giwolufasugur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96a.bin
a41f5757fbda9721ed14b2cfb8eb037beb8823a760870e122ed18e33b951b84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 5516 bytes

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