Malicious PDF — malware analysis report

Static analysis result for SHA-256 566b8dd591be8896…

MALICIOUS

PDF

100.5 KB Created: 2021-08-08 10:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ad4146b9af3dd1fc6e61c756099ba40 SHA-1: af57ef6d2ac137652573ffc3cf5f5b558b3b4ac9 SHA-256: 566b8dd591be8896e28862a4c9c8cce60985f859cf4c61663dfc2dcb204df2ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://diskacme.dk/images/upload/file/93685703779.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8telitit7e31o14h0d2m2sdo1a/67863142143.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/61933644595.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2114da664d4c349104e9dbfc53903af7/muxanirirebutodonu.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/51722646389.pdf
    • http://wsm.hk/images/uploadfiles/file/jolupawimetugofipadi.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0070906d66a5c71b0f1d905926db3681/dovexopezuxikageko.pdf
    • https://nadamasristorante.it/file/xolusofajokafavagig.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dbe7f4103---81831507756.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/621fb97a402ca8c088046b010e6570fe/63974280800.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91816edad---6465365186.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a7324103---38400740285.pdf
    • http://3xlove.com/uploadfile/file/fidepiduwemudoxor.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099952f6f123---80715198102.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8cc37f1a74403ca9f5e9b08ec6f1ea99/26820028635.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eefded2a88---49465180077.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cd464330b3ee47320939fccaef9b78a5/toxadexaf.pdf
    • http://sgd42.ru/userfiles/file/merebafiripebanojefiruw.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5cebbe30a---88698465785.pdf
    • http://trendybiz.in/usersfiles/file/zovexuxawi.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609719491075e---41291331550.pdf
    • https://goodline.by/userfiles/file/tudukaxusafegewex.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2465f3148---jawolize.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+join+kdf+as+a+cadet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 16792 bytes
font_01_sfnt_off00012799.bin
4a1e3041f8103a7d4e2e75db273aef650521616ab0c63d2aa14cc79fae449a56
pdf-font-stream PDF embedded font (sfnt) at offset 0x12799 16324 bytes
font_02_sfnt_off00013dbd.bin
e5dad0af031905427fb7275cabe2ade39b5a16273c0b654c62c2d5f7b7fbf404
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBD 17464 bytes
font_03_sfnt_off00016b2c.bin
8a54a28fa2ec32431f3fea2181c06c14df29f637709ae17216ff7ca72f506743
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B2C 10624 bytes