Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b983cf5fb9d27b2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 04:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28f58d5f364fbb6afaea39dbae4e86ae SHA-1: 8ac0968f9099919c131cc6e7d11dd1aa63beda1e SHA-256: 2b983cf5fb9d27b2da2b78a8e1afacac2e260fbdf42b4a8510a037ddac2ae2ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute further malicious content. The presence of multiple unknown URLs indicates a phishing lure designed to trick users into downloading additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a516ae424---10614842030.pdf In PDF document text
    • http://suriyedostlukdernegi.org/image/files/guxifubononitufum.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/jiruvawuxakikipabaf.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/21035716436.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/winikesanifogupinur.pdfIn PDF document text
    • http://fkhd.cz/data/img/xetesebelibebukif.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92825fc19---tadawupelemipuzorojew.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/145832773260fec23e3e4f7.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d10bc819b---8431168854.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/3348310197.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/73866945037.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/tegobexolejukevuf.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/duxujobojesata.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a8843fc77---43671042535.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/guwudotizodaguguxo.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607453ea8e550---wuduninetafisatibor.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4b537f28c43c71936e70a25ebbe5a6b7/padeteluriroxexuka.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafcff3d8c---51641133733.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8be477920c6a581f6833d6825db5c570/786413026.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/df1b89a74dc753fdad40f8ea691c749c/ganesawugokaluvogi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2c33a93f292ded0673f197dc527cb342/zejavu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3605e443---73459294208.pdfIn PDF document text
    • http://abc-tel.ru/data/File/lunurixanugezetunev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=klb+biology+book+3+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 17724 bytes
SHA-256: 3c5f2935f57854566d247085f73b8dd822149df4fb665497a0528728bf1e003a
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 10420 bytes
SHA-256: 19f65d87c64866059dd1e7fea924c4c021586c5201b27c3edb4a5cc3b1dfa6b3

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