Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c817ba7c73a683c…

MALICIOUS

PDF

79.7 KB Created: 2021-06-26 08:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d338ba64613df33ef6bcbcc731c1af02 SHA-1: 2fe63ddabef69208f10d246c478b68e261cf24c2 SHA-256: 0c817ba7c73a683cb331ba6c67526ef187d387595d467e9fb73f66a2221b7d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, hosting numerous PDFs on compromised WordPress sites. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c455373071---wuniraxelinex.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bfe57f5---kovuxerelomovanonirob.pdf
    • http://naturalmis.com/userfiles/file/88964022711.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/976h5gph4lnvfts5drrv7stjk2/xupibeno.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16097488458591---5346972541.pdf
    • https://airbays.com/userfiles/file/69205154313.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/rb4mnd3hft8dse7bsekkhu25mf/lefadawo.pdf
    • https://mattress-leader.com/media/1495543152.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/66b487872bae36d3f8dc27c49c884424/12343471390.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/namivejopiwepifugurabu.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527071645.pdf
    • https://www.alapan.org/fckimages/file/ratibolajes.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sehci71nb11mmc7bnl61bbav2b/biradubemodoboxisuzejiniv.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082657a76092---savologa.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db1688178---36573849592.pdf
    • https://aarhuskortet.dk/images/file/witulenipuxedobujipiwosor.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c14443c5---fajusab.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b7ade717---75865215933.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6c0af13662e6780a72f67c60edd91a57/18082906936.pdf
    • http://montaze.org/democms/userfiles/file/68859409002.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bcc3938cc---sagotumanizuxugawawavopi.pdf
    • http://humanitool.ru/userfiles/file/bizepeverolibilad.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160944c6078f48---wufidanuwaxutisikixef.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/93d30b39f03654e2f652903023254514/11565289896.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c288f59c857---84103893577.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd27b171765---boviteniwakakogifaxiwud.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+cloister+and+the+hearth+writer+crossword
    • 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_off0000d594.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
font_01_sfnt_off0000edab.bin
931ebe6230fb80da6f4e616f5c702126224fc2d538a32b138684352cb8bd76a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10516 bytes
font_02_sfnt_off000105a1.bin
847c89c219d594a92765d489b98981a8fd5c3c841cb290d8bb0d020d551dc3df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 17064 bytes

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