Malicious PDF — malware analysis report

Static analysis result for SHA-256 c878405a801d3205…

MALICIOUS

PDF

114.6 KB Created: 2021-07-02 11:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6320d5ad211727dec06046155024137 SHA-1: 72c44bbe029b1177f70a807de32fb7467bb6081f SHA-256: c878405a801d320530c1690684189d28b72a5495c626e03b5d2f9839d97ae168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a significant portion pointing to compromised WordPress sites and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://pnmanagementsolutions.in/uploads/vivogepaloxefirad.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e911f0680e---zimurinapuxalif.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/54621970b4ba506dfea0954321415f7c/pedodafufir.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3191ddbc---xutemos.pdf
    • http://ambvet-trefontane.eu/userfiles/files/43389734761.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/80o13btot9oal6occch98vlcu1/nularakuramudupow.pdf
    • http://bettynblue.com/upload/fck_img/20210603/file/12372931488.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4f53a40f49b8a2736ad89108072f8976/69249045788.pdf
    • http://thayloilocnuoctaihanoi.net/upload/files/rofewer.pdf
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/vusimo.pdf
    • https://rybczewice.pl/userfiles/file/58530757663.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ethqpgebqdfvj2h7arc6saed7m/76723135315.pdf
    • http://nirmalamathachurch.org/cms_uploads/image/file/8004837629.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea90a4d85c---regaxon.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2db6a8a56ffa0dc1e7dea22a747f809d/xenidibezon.pdf
    • https://alianzatours.com/imagenes/file/komid.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29581a3db---watevubilotiviralazobe.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/bewikujaletofiguw.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12efa6af8---68442021155.pdf
    • http://myphamhelios.vn/luutru/files/94485734925.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53dc629ae---93786205244.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/30af43a90991d93ebc9d0150eb7f8d4c/nitevufikanenomuba.pdf
    • http://twxcd.com/img-aim/files/92851044232.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27dadf7f8---muripuzuw.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/923f0bbe9a5fce284bf663dcf5ccb744/bikaraj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+ignorance+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017e4f.bin
ea46963a4d214a6266f77576b09c14f5c96e487994869998ad92f372154e4236
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17E4F 23696 bytes
font_00_sfnt_off00010a0c.bin
d20bf61d35443239664ff4f7bb2929ac22a2ff108554d424a293a64086d84bf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 28512 bytes
font_01_sfnt_off00014e6c.bin
fb97c050e4eaf0683670362950b37f5fdabc6f2dc7c7c603acb3a0670834f2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6C 10508 bytes
font_02_sfnt_off0001663e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1663E 16792 bytes
font_04_sfnt_off0001ab47.bin
7b49aec0ec23116dabcc2ba2ffcc755ca3ebd3baf214837d4de87b2440d9284c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB47 3832 bytes