Malicious PDF — malware analysis report

Static analysis result for SHA-256 827f897d06808a0d…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 15:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87d7b18e0cb0a55ef7e30ee14cf52869 SHA-1: 6c9f85b957cb66f8229064d91a5e9bc1b7ee0a05 SHA-256: 827f897d06808a0df40660c473ef2f490d62b71068c42b1b301206e1439bc008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2255378773a7ffa4ba291f981338d3b/totufavowidaline.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ccf685f96096919272ba3a99e0cfde5/92442373230.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160864e6adc4fd---49627066092.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/95b24be82aa9699f3c496f675f7e420b/6714841333.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607699d585810---sazudovenon.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4cdd7d606ee391aa9b2bed14cd4d8e27/petupasow.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/16356905921.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/16e7d0335b497f2d2ce3e904331d0152/petofegub.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22db7a268e---batilubalidosidusos.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69b13fd72a22b921ec42f46c01307306/jotamudosav.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160892cf4e73ff---vakizagaxefivexejimow.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2ad774265cb7a8f43a983a5761e63fa3/lediwevupe.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160975c96bd017---rojikomuluribekoz.pdf
    • https://hohsingfiber.com/ufiles/files/82717465479.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uigcv2mtrgr4jp7sas29u7gsil/gotokasetolixakisuvo.pdf
    • https://bisnismedsos.com/userfiles/file/mivetezise.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a635f244---9267276659.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/83364483341.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609424299eb42---99627402307.pdf
    • https://zlato-eu.cz/upload/files/75234438633.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd900f3a24---xexov.pdf
    • https://dpt-mh.com/uploads/news/files/99644658425.pdf
    • https://powermailer.in/userfiles/file/15024818557.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2ffd459d---71068059395.pdf
    • https://artenika.pl/fck/file/demalitategugunavuwu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=techno+made+in+which+country
    • 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_off00010379.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 16792 bytes
font_01_sfnt_off00011b90.bin
5197cd8a2e5463b6d06c3fbbe1125469311bc7991ef688f6d70c4865d29f72cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 10684 bytes
font_02_sfnt_off000133e7.bin
21a9e35c58df4c252a19113d8ee08efa10c2d7eff5d06312564cd6c40a0e46b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 17680 bytes

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