Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f42b1208659b2e4…

MALICIOUS

PDF

96.3 KB Created: 2021-07-04 14:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b952cff4d303c3890effc63ee4745bec SHA-1: 5da2850ce53844411dc90a81bdbe348086011013 SHA-256: 7f42b1208659b2e4f475569090813408a464629c451fb579ac91f6ac765f4471
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5e4651756d84317299823735c661d164/patazitudenakaresitab.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609282497b6b7---vezikagunuboxesorawowota.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6e78fc137dacbb74b6b9a946bd2a8e4f/bezuvimadure.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2e65cf56554f366f361285c3db0ac873/puliwabo.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608543eadbc92---37017037615.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/420b27ee87328e31d1441df92dcd6de9/tovaloruxusumadolovavonaj.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ff0314be95be9db4735c4936b146db67/xabidopuwovofewobox.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6221c8b3cb---kerop.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e34b6820---juvagopariginef.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4f4cfef1---xugolaf.pdf
    • http://kurumakaitori-one.com/js/upload/files/ximitudule.pdf
    • http://kashima.cc/userfiles/file/sexekuxup.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/aemu2vn0tl7uuch1n8mb1j5sfl/vugogo.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2da15dbf2---vuworiroj.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608418b80fbe4---xanimavofokiwokobizufajob.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3b53dd3d04c9af00a760119813ae52f9/28296574446.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cbc9dc904---43609084204.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c8kj82vnant28rib0b8q51tp3t/lowinebimugapu.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/6facf287e8630898a53213959f91730c/dijemibaxubepajid.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608303ad6eda2---31807373127.pdf
    • http://klubalfa.org/img/userfiles/file/25576351665.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d967f386f---1721819228.pdf
    • http://hanboo.cn/Uploads/file/2021061912552670554.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/de4b1daa5413d82e4bc8ab3713606a3f/benonibow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2+guys+1+horse+link
    • 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_off00010db9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 16792 bytes
font_01_sfnt_off000125cb.bin
a9ca6aa8bdc291f9da4e60a9556c9d0e5e5c9b4a20c700e299a5cb192351db45
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 20280 bytes
font_02_sfnt_off00015ab5.bin
f9f5339e820692dbecaf96b43a3644d2f2e94e66bcc3d25b45c92aadb1f59a05
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB5 10508 bytes