Malicious PDF — malware analysis report

Static analysis result for SHA-256 711bdf7bbfc54b21…

MALICIOUS

PDF

94.7 KB Created: 2021-06-27 11:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae61f6642af20524dc13d675fd2b5d47 SHA-1: a18c3452754a6467a06fc624b25f579773021800 SHA-256: 711bdf7bbfc54b2108aa5a43693b9e8ba828f6c5b276505ff8438307ae72173a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • 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
  • 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://terezmisszio.eu/files/file/58590609220.pdf
    • http://archi1919.com/smlclub-files/file/62752525462.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070828ea9879---96042599342.pdf
    • https://gizaviation.com/uploads/files/45782448795.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075922fb9ba3---56990253345.pdf
    • https://deltagroup.bg/uploads/file/51305786791.pdf
    • https://machnhaduong.com/images/uploads/files/vijotujepok.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adf82acd682---5905261691.pdf
    • http://vickerycarpet.com/uploads/images//files/vemipovokegewuxa.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160832ecc66e00---mexeforineragi.pdf
    • https://dm288.rs/slicice/file/29767928906.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4d43b43fd4657bb86a39b0446704d3fc/roxemegolexavoberubosej.pdf
    • http://ytbozhuo.com/upload/file/20060801989.pdf
    • http://foodchemsino.com/d/files/88575124755.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/notititusisuxotaluwogoduj.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609989aa64322---43872363336.pdf
    • http://mai-colle.jp/userfiles/file/43179385234.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kisd60f99ttvotc3r9mj6srsg2/gixumomezew.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d0vop8ldut9nr5q0ais8os0rgv/11498075416.pdf
    • http://ranaghatpchsschool.org/userfiles/file/vusazibugu.pdf
    • http://fujiya-la.com/uploads/files/63924884227.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac621acbb0f---6787315170.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/88834d2b1c0160b64d7908b60120a974/zofaripenasa.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qfmf0qkktb23todh0mopf05pu3/409087550.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/iv8agasmjvmt1mj5d917eaksj3/wozixosi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2ba0a7e7eb385d05609cea97f72af320/52142341324.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qtah81ftdv24ic4kf5ed0bt1u3/zidapozupozasopiroje.pdf
    • https://jackkornfield.com/wp-content/uploads/2018/01/20170130-Jack_Kornfield-SR-the_genero
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=generous+heart+meaning
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
font_01_sfnt_off00012381.bin
1430e7751026c8934441f01d613d9f603249d35d7deabad0b4d7e310901915cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 19188 bytes
font_02_sfnt_off000154ef.bin
e501e1d92ced1b2ed49127ee949887c38ce8a6314f449a5622d3fc672de91107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154EF 10648 bytes

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