Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ba7d4178621d33…

MALICIOUS

PDF

92.9 KB Created: 2021-07-16 10:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26b135cdc404a1d9a918f6fbbe5e575a SHA-1: ea14df6fe8b6e3f980797eb51020545088b401f6 SHA-256: 59ba7d4178621d33ab25365a433c3b63accd282c589ded3fc571fd1923617219
156 Risk Score

Malware Insights

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

The PDF sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links are likely designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57f66f8b4---26150718920.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702577a7f0f---36253883844.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/sprjttti60pstuc9knep7uhv95/lebigakonobinoguluwosib.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/felokogidata.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6c36605c---fegimekibu.pdf
    • https://colakcivi.com/userfiles/file/99611540738.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/df0de02146ddeb243d6966dd86e7985e/numekonabedufapusabobid.pdf
    • http://apcmagon.com/userfiles/zasepewoj.pdf
    • http://daoltrading.com/userData/board/file/88635978813.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/42462881400.pdf
    • http://malifer.hu/upload/file/91805119706.pdf
    • https://penzionradvanice.cz/res/file/kasalemexotoxi.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/36174363974.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/95817807517.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c933738946---96475164358.pdf
    • http://asr-net.ru/uploads/files/mekinirukivur.pdf
    • https://printsolutions.ro/uploads/wysiwyg/files/xuzakexalosalenij.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c77cd3a607---10910913937.pdf
    • https://acronimocostanzo.com/userfiles/file/fitetoxarawokolakavomeke.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/54753766415.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5abd37350---nironipezes.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/naxefaxakuvevajupizorelo.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8e79646a---dulotalozeponinobasagagol.pdf
    • http://alemotta.com/resources/original/file/bamamivopijiravanoto.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/54a7c30bc671b2ca4dc8fb90443905ca/gugokuxolimipufata.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=3+day+water+only+fast
    • 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_off00010a25.bin
8390a1cf6c4e49b78a441234aa0b9c4a4f9107db9cb5790a126fb75705b319bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 10528 bytes
font_01_sfnt_off00012259.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 16792 bytes
font_02_sfnt_off00013a6b.bin
56e08a39560861713ee41c8361193b08aaeb19367d2d9aeb5b3df141b277eb44
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6B 16984 bytes