Malicious PDF — malware analysis report

Static analysis result for SHA-256 e292adb86944560d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-23 06:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6258c0aab3fc38a07c67d1272c9ce72 SHA-1: 880e5d06e7a86bd2d8458dab351b91eb8cd58481 SHA-256: e292adb86944560da8e1f8ed9db453b688ba56611c5437b8ad3a1ae1c8e70fe7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it contains malformed exploit streams and functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://coytex.net/ckfinder/userfiles/files/sizugufebupiduniwoz.pdf In PDF document text
    • https://esz.jp/img/editor/files/moboz.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/10588665078.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/tasalawadaxojomana.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/73452788223.pdfIn PDF document text
    • http://ropesadventure.com/d/files/mimefonoxisakurazasujo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0a8fb6c1374170284efb81a392261566/44601188627.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/56048749890.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/riladaxupesof.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/vixinugebemovudar.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/32180693230.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/62118064574.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/gejabadureloxirubudaxufu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k19msi3kmiqk93q0sgkc549v71/gosegapebuvo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/vobafisapekepa.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/guwejinatowubage.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5344de785c8c42a8e19feb5eac066f93/24334785773.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/877474558.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/guzivuvagojaxiwojuf.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/97275092656.pdfIn PDF document text
    • http://gnox.vn/upload/files/41793995511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=game+hentai+hpPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 17092 bytes
SHA-256: 5fd1837070d83ef1be0cfed8bf6b7b00f9248844e4247a5492238ab69f959a18
font_02_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 10120 bytes
SHA-256: 73092fac4de2aa8c307d29eb837091b670f97d8e79702a94d1710457230107c2

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