Malicious PDF — malware analysis report

Static analysis result for SHA-256 0659b6db3552a034…

MALICIOUS

PDF

106.0 KB Created: 2021-06-29 09:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99e8fc72c5304c98bf74fb6425c2ac1f SHA-1: 6268ce9461d8b99c5d2e413a3b0efc88d723e5f9 SHA-256: 0659b6db3552a0342398873f781d9dda2e99ae5bb5c8076bc3cf8ca70c30b11c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=ecosystems+theory+social+work
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/14e7c020991bc6b839291d7fc6a7bb3d/kobupunabakupepujan.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba83609e310---mepifusawan.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b6eb23208c2554c87e9ee934333d9a13/58263740616.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092315dac40f---42082708547.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f1c551d9070435aaa01c46c200a3040a/zajerak.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6cdf530---66217279930.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/32519965026.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f33a14b710b09d7a09d1eaff3aae8caa/kopuduva.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8731afb0---misusagaxojuluxakuzeg.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/r7fguq2pjh7if1b958tf3b9a1h/30453733703.pdf
    • http://botosani.ro/img/uploads/file/xunawomidegorumab.pdf
    • http://aftaplan.com/works/peepsparty/html/upload_files/file/jiwumelidaloje.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b813361e00---mokufovikodukufiruwamo.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32366396c---65319042595.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/nm9s31nu9bnfke5jaegtce8mg3/79375798798.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608a125670a72---pikevejejobukime.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609eddb61d8c3---2236668369.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082724d6d69c---bovoxibidipejegata.pdf
    • http://kfbi.ru/content/file/jamigotitak.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/8200020261.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/gugozojigikoludiwe.pdf
    • http://4reality.cz/userfiles/files/gobofelejer.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d3e97459---88400335409.pdf
    • 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_off00013aec.bin
bd63d7c758e1d17c0ef5118f315b2993f35f00f4be3901d6eb4c057ed10d6ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEC 18100 bytes
font_01_sfnt_off00016a11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A11 16792 bytes
font_02_sfnt_off00018228.bin
c97fb0efebcce036aae1d8a4db3f6116b085443c1fffaa2ad9858eff5711d45e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18228 10664 bytes

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