Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4332fffa9866508…

MALICIOUS

PDF

73.2 KB Created: 2021-06-22 19:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55bf4d1620eab45f01a3a0ebaec0917d SHA-1: 15b599b25da51ed286f42d803cde16b60fa11be1 SHA-256: e4332fffa9866508723a5314ea7c8b3c347b8bc7f4547062db65ec949db110ec
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of the 'utm_term' parameter in one of the URLs indicates a potential tracking mechanism for phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

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://inwebjor.ru/uplcv?utm_term=outlook+express+download+windows+10+64+bit
    • https://pasarantogel2.com/contents//files/roveboxonigofewobas.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/v0k23rbfu58eatm61qc6g9nu4i/guveduxiwabobanigu.pdf
    • https://agermag.ro/mm/file/24154043708.pdf
    • https://altonika.pro/files/fck/file/pokodolixunevizi.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/fojapano.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53c2aed300---93904844469.pdf
    • http://adabaskimerkezi.com/upload/file/nekapud.pdf
    • http://ahlhy.com/uploads/file/100545374539.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-21/20210621124247654253.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531060200.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b506b5bbd389075438404fac2596f96/fuwugol.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/97dde9bf75e23b1e325275e4a16b16bb/kulaz.pdf
    • https://annjulieskarpmo.com/userfiles/file/pejafufufatovu.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/lbf53uabj3b2vs6l33opidooeq/71512275478.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/jugetekadutukelem.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d001c22730e---zazasisaso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba9.bin
cdacd9a459319e7b9428cc0f6dd24a4ed4ffa6e4218a07713a8640dd12460244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 5780 bytes
font_01_sfnt_off0000ef71.bin
f54378329b8fddb0266b2d55f60f5d2e2611db158a4ee3d46180ba5df77d835d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 12676 bytes

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