Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0256cf404ca2f…

MALICIOUS

PDF

100.7 KB Created: 2021-06-30 13:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed56323c479e099790de584091668511 SHA-1: 85ee3926875aaa5f783949b9b61cb522811fa30d SHA-256: cdf0256cf404ca2f12d338ec2695faa2318446c1556c1c999458be64c0181dec
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as landing pages for phishing attempts or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce71eb18dd9---gedejubunada.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d6155150---mosazelebemelunuwusexo.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cdb3bf3ea7a58ea0acdba2e47aef1755/22495279484.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7e9eb38ea71d75651be4ca12ddfca49f/zesaninisexesovivakilis.pdf
    • http://brooklynsmokeshops.com/admin/images/file/86344372769.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/manogrb34h2hakm0dqbtuf5os4/putakawepokegokejawibawam.pdf
    • http://timandlor.com/userfiles/file/40355443412.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf9am820itkhpv8cf1htt9uvd7/bonanupe.pdf
    • http://stolizstekla.ru/userfiles/file/sojolenaxosejixeduwuniviv.pdf
    • http://adabaskimerkezi.com/upload/file/lutaveveboxunixatoluteta.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/325f834049b539acb9958389a0d6421d/damikojatizogibetiwa.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f8f0u5hcv64b0so2osbg3lljr3/raxusixixu.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/38b9cb98011ffe45a5926ad8f444450d/wubalolubiseda.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55771bcc8---dejenin.pdf
    • http://lhsclassof68.com/clients/73441/File/tisomepabogaxedoziwine.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7457b59c---fimenuwez.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8r71kosukvir008ccbmb5740kr/29443173023.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jdt0nhfdnil9kvmj1e2a4rpag5/wiwepupibaguvesutufejowu.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6fff32ec024e2e63c17be4f661f6d821/44544884961.pdf
    • https://aiaciran.org/cache/fck_files/file/vusijetazif.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a18a1a1bd---82014494818.pdf
    • http://tznjl.com/userfiles/files/ruzebu.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d12a89744---78570513962.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/af1548682ef894d491fd1995640eb143/48421788070.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=write+a+letter+to+your+friend+about+your+visit+to+a+historical+place
    • 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_off0001249d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16792 bytes
font_01_sfnt_off00013cb4.bin
82ddbf902867bc9d3f5d85de3c4312f6a97f5dc21731f68cee1519545b0b945e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB4 11128 bytes
font_02_sfnt_off0001566b.bin
d18bcde120bdd1e1b11a99f6a43e07b5a6311270cbf08a8c9916fdef1b367309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1566B 18072 bytes

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