Malicious PDF — malware analysis report

Static analysis result for SHA-256 80168544f6ee0f79…

MALICIOUS

PDF

91.7 KB Created: 2021-07-17 15:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed462d7ae5866bf2768b18a795007f24 SHA-1: 6d42fe0a1b59904c1141a92cff97a3137e2fdbd3 SHA-256: 80168544f6ee0f79de0f7070fb60dc7f5ae23909a7757fbca0cdf49b1a6eb6a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5ceb1701---pulixowonujafediribuputa.pdf
    • http://hakkabrothers.com/userfiles/file///votodozen.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovnivrq44ju2p2omm305mf3une/36254557073.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/33125e6b0bacf3e19b3c962d9cf033ae/82835106260.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/923ef8912c1f9524cdf172ed37d31d05/88874879097.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/pavejisatubeketosodop.pdf
    • https://parokisantolukas.org/Uploads/userfiles/files/7631684672.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/lizesevezixafubuzizaru.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160945066d861d---49253258890.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aaf6be0810a62560f60fd9825f3efcd7/zumapakefapeke.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81ada7979---tosunirezudisekodex.pdf
    • http://cathugo.de/res/wysiwyg/file/45209676381.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160977261ed477---winavev.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00a6c12d6c---25703048195.pdf
    • https://olterus.org/contents//files/zasite.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fe65c8690---rovilonojamezujalin.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ne8t8j3srrj0lrakkqvok8r94/nelefusovised.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/82d80ed92e2570f4bd373957e7fcca73/gebiwelurabeselirolajep.pdf
    • http://andlupa.com/userfiles/file/7469716356.pdf
    • http://aaaexpressheating.com/userfiles/file/dugatapabapadelebad.pdf
    • http://magendans.com/imagefiles/file/gajuzarexetonapizegu.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad4bd6751---miduzu.pdf
    • http://creative-format.com/upload/editor/files/74744321518.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/kr1faij8o4484b3qhs9b85kcrm/1830550005.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=helping+out+a+friend
    • 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_off00010536.bin
809a4fd4ee08e7313efb1b1546a56e5c3ca881b0919347560186e3fdf31c3056
pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 17152 bytes
font_01_sfnt_off000131ce.bin
68039272fd913b0c0b0f0ab3a642ccd2d550919042fefe84c852a174b255b3d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 10596 bytes
font_02_sfnt_off000149d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149D8 16792 bytes