Malicious PDF — malware analysis report

Static analysis result for SHA-256 667ac733a35fdc0b…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 21:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd33bb45857d01e6d781ebf83a77af74 SHA-1: 7bf66b43fc224157384e5bf97312ff5f6da4ead4 SHA-256: 667ac733a35fdc0bb8d47a2ab867a450665c6962b5ece5e2f0606d85009737df
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and disposable domains reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d451ab402---94326361170.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8bc62dcd7---24511172638.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dacd4dcedf---xasupofi.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/902115012f5d3195f1fb1699c4bbb0c4/19580146807.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3ngd49gg21jcpo37j06c81j6km/28871446311.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5986600b3---20709487092.pdf
    • https://betentour.com/sites/default/files/file/wabuvi.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e50eacea0---xasukijepe.pdf
    • http://www.aportecnica.com/imagenes/editor/file/27611398209.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe284bd9e---10925022355.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831e2b69ad---rujupa.pdf
    • https://estoniapools.com/contents//files/faluparononat.pdf
    • https://numen-wow.com/userfiles/cloud//files/senufaferuwilorejimo.pdf
    • http://richmediahouse.com/admin/uploads/file/xosikeneselun.pdf
    • https://cristalensi.com/public/File/niragup.pdf
    • https://airflow-skateboards.com/upload/file/nagipadimarawe.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8e6bd81c---jalikosekegomol.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb34d44cf4---96306924840.pdf
    • https://ncvpte.in/userfiles/file/ketezivonikogosiz.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/jchjtunlamffd5pfc2ono4rp5a/76034555648.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160758565a055f---57797035690.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/7afcb69defef65bb560a1f8010b1fc33/21324785734.pdf
    • https://led7.ru/file/99643259786.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8f4dcc390f7925f1064d0a19d00d6312/tonarapuxesasogow.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33be63648---66777322884.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29319c2614bbe844bc70ad6182999e21/jabupovobetixadut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=example+of+torque+in+physics
    • 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_off0000f8ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 16792 bytes
font_01_sfnt_off000110e5.bin
7482b9e1d93422287c19dd5260eb3686aded8d3282f6f274a6cdc9dd50f0c433
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 11188 bytes
font_02_sfnt_off00012ae2.bin
5ae8418375e27657ba8d49ba16bd4140f178925e24a33beff15559ac110d274d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 17720 bytes