Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c8dca1b6d57e67…

MALICIOUS

PDF

83.9 KB Created: 2021-07-05 04:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f7b9c7b08b42c8b3e73d02098c76cc8 SHA-1: 1e50b1e80c6a64c31dd2cb88f1a5c0fea8b9174a SHA-256: a0c8dca1b6d57e67a37cb19e7fd764028975a54916321aa891835a8c70abdd8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5652debd0a---58635468547.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46351bb5---musuziviworabesud.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1f6567991d7de55159225a3aa47d6edb/nasukazosumasisesopenu.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d21cb267---jixiragamubuzomivu.pdf
    • http://villa-carlshorst.de/sites/default/files/file/povebe.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41fa8a343---98904040711.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160726cdda6e07---monelafelevu.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c234f2e7c13---12817917409.pdf
    • http://capitaloffice.pl/fotki/file/92702541252.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/iap85h7jkfc8pe1ucoehvk1hsu/69761661880.pdf
    • https://ltssinternational.com/res/wysiwyg/file/binej.pdf
    • https://xo-sound.ru/userfiles/file/wuvudobenowux.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/98537751586.pdf
    • http://aldo-ins.com/userfiles/file/kiwusabifojejubigiselejaf.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e195b77a9fc---31461916464.pdf
    • http://teplospectr.ru/images/files/44256845835.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac77dc78d0---8942192734.pdf
    • https://susta.vn/userfiles/file/masufepipugubidotawaz.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69902045a---wigurejozezokefebejupej.pdf
    • http://tecresconsolidamentorestauro.it/fck_data/file/1784559267.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ab7e38a27---murolifobanojodazudul.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/65da65e49b6c700fac5b63db35fbee72/54845755118.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/qndqardnp76bl6n4pe5ekkhc3h/motalijogubilewosubap.pdf
    • http://multi-accueil.fr/ressource/site-image/files/xofoz.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901af34da58---32798811284.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c132b39e62f---menevogu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=technical+analysis+for+the+trading+professional+pdf+free+download
    • 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_off0000e3aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 16792 bytes
font_01_sfnt_off0000fbbc.bin
de7be000ccda8c30713173483c5f9df5a23223179f757452f10d71fd3ef92a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 16812 bytes
font_02_sfnt_off000127e0.bin
8ccfa8daca7da949a83d6248622faae71ac0286d866fa67308a65e1a0a1d77b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 11064 bytes

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