Malicious PDF — malware analysis report

Static analysis result for SHA-256 e929218ed8628a83…

MALICIOUS

PDF

96.8 KB Created: 2021-07-04 13:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a6b083bde90b9770e0b369705b4e987 SHA-1: e81934fec9c53be9be2cba4293f3d9ec24cd0a9b SHA-256: e929218ed8628a83504023acdf335746213be79a787bb2ea5bbc00955ad7ac8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure of the PDF and the presence of numerous external links point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://medvor.ru/uplcv?utm_term=the+love+of+my+life+book+pdf
    • http://didopack.com/files/luruburexutifimilokeni.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/940437397f4217f58dd70da2c26acb1b/53631425623.pdf
    • http://www.chubsorn.com/file/files/kivexaso.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vl9mhg0noaiijuja45hdohsehs/natukajapasibi.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/gojiwexu.pdf
    • http://chromoink.com/updates/file/66866761461.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/webidula.pdf
    • http://accessprecision.com/userfiles/file/vamonudafegutigulapuje.pdf
    • http://vivatbacchus.hu/files/file/80350612423.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/otk1k6p1o352t1ut8thmgtartj/zunuxelukexomase.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91969d0be---manavalekarajiraj.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/do1af69ob4e46qvg195s75q865/19867321139.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7dba12bd0f4d80cbfd2f36cd4ce24448/biwuzekimazakalisa.pdf
    • https://aimhc.com/userfiles/file/94318935673.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a874665294a---paxokodojokevozogovapexa.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7iebpbs8iqc4hde075vg3npu3a/ribofulagixavitujogufafin.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/921t08urtqfqng1ii6536i5a3u/kelarebupuxoku.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/iapp3pqpu3pomtvcbbodqnoaf7/zefizuzikiletifapejedik.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936c59914---jozutisojelujuzetulota.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8bbc57116761f7cc750169712b8d86f7/xedunapub.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/931ff4150dafe0393b07935035fb96fd/xanulowotupe.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072043940207---zibupedisep.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160842ebcb6d91---12332461130.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714a3848e31---75974966763.pdf
    • http://megat.pl/uploaded/fck_files/file/radike.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2b3636cd---bobodemoguvu.pdf
    • 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_off00011805.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 16792 bytes
font_01_sfnt_off00013017.bin
63f4414af95481de5b38148f638fcc416de3aed48d5c285cb2d41a0867f49bc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 17716 bytes
font_02_sfnt_off00015e2d.bin
ed7909ddea4f89f1a958d262ee84fe5646f219e72ebbc33c04bcb73bc85ae1a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2D 10508 bytes