Malicious PDF — malware analysis report

Static analysis result for SHA-256 21501c2ce961c0e1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 22:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c5fe97257ef1d2117d4198fdcf92b6d SHA-1: 837729dff4492ec41f7e1659c6c1bc5e94d63b2e SHA-256: 21501c2ce961c0e18e7e78526de96903f0989692f5c74ff6017047466ffe42f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ilonew.tasksplan.com/ckfinder/userfiles/files/29387140103.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lrac0mmt067c1l911suj9mn7tj/48357767538.pdf
    • https://redengewinnt.com/userfiles/file/lazogasonumunerepobaw.pdf
    • https://biocoils.com/img/file/36881387615.pdf
    • http://canvangdientu.com/images/file/35649472767.pdf
    • https://dobre-akce.cz/media/files/file/padawovezipidi.pdf
    • http://pandoraecza.com/genelresimler/file/parabejugutusogedipagusib.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89599c087---97188058480.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f7ee6f8b5---28250462459.pdf
    • https://lhorizon.ca/uploadHorizon/file/37801619990.pdf
    • http://www.mustwalge.ee/data/content/files/17996095226.pdf
    • http://m-s-g.ru/userfiles/files/varopofowefoju.pdf
    • http://tomekorea.com/userData/board/file/sikumufovewadelukofem.pdf
    • http://detikakdeti.ru/img/file/67531821629.pdf
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/70203677197.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/ravis.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/siraleladobelanip.pdf
    • http://samtle.net/ckupload/files/mijetofopegesul.pdf
    • https://gancza-yacht.pl/userfiles/file/3935783130.pdf
    • http://webminmax.com/userfiles/file/65717669322.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=real+time+games+android
    • 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_off0000d839.bin
03fd72d9c75a6ba5bf3aa5654e19aa38276b7fec99fecbe6b39f7396797008bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 18628 bytes
font_01_sfnt_off000107c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16792 bytes
font_02_sfnt_off00011fde.bin
ed354f1d643ed0ac8f1361d6c1185b08babf8e6a87d366817d19d1d5b100e389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 10636 bytes

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