Malicious PDF — malware analysis report

Static analysis result for SHA-256 9713c21c32effc1b…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 23:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96c82e373aa68e1cbcebe246f0bc069 SHA-1: ce1b7512fcb523178431d746375ed8d12bdba2f1 SHA-256: 9713c21c32effc1b7c6975e09d04a3948e50b4f6efb1a0d15cf97d8e4bf62bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3cffe4ff64a29b71c4ccfe73b5b9cc60/kaxiviniwekirar.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/80fbe84a967f851c33879110baecf777/xuwapapimurikon.pdf
    • https://sedefartphotography.com/resimler/files/66811556123.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c1a6aa808364746c3acebd9f3424e18f/70257838404.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1f7dfad4---mikaxokifujeduwimanosazan.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/tllr6c9dirjf1bdg9f915uqc55/bopazazukudenef.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/p04kaspp56ok97qslos83gefhp/78456029349.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8f7n2n7tu70660aeslkt6a56n3/33522238112.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083294c9d7fe---dufubi.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23c194de4---85370131183.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d92c62d---zomuboredowu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bb72de9ba43---suzugoguxoporim.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hoq0cjfv486fhaicbabme923g4/83782111353.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f496760f957288474504a4f04eb5fdd7/48936232774.pdf
    • http://bellsazshihtzu.com/clients/878694/File/99781039288.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c02d3019a---13289342582.pdf
    • https://arzhosting.com/calisma2/files/uploads/87300940577.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ekod6ji9j2su2gfh3b0jmgmefp/vowoxasugaruno.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/717235a22f13ddc434efb850fee3c5f6/lisarezabukomixodatanuto.pdf
    • https://abugfreemind.com/userfiles/file/19338969323.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071e68421b9f---bobiwa.pdf
    • https://digireg.se/upload/zepazef.pdf
    • https://questyme.com/userfiles/file/segoxeb.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/980bf1051c7b3d215730b873af310480/levutujanifukobuvubodoxo.pdf
    • http://2ds-creations.fr/userfiles/file/patukisabugaguzunoj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=excel+sheet+for+construction+expenses
    • 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_off0000fbc5.bin
ae490f17470d6624d678de60a59fb4dfead4c543af3a9049841ffd959e282f55
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 17564 bytes
font_01_sfnt_off000129d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 16792 bytes
font_02_sfnt_off000141ed.bin
e47be244549a00c7ef7f8624e6f49a5a42f1a1193f3a6a9e35603c8e0a33bb99
pdf-font-stream PDF embedded font (sfnt) at offset 0x141ED 10600 bytes