Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40d4531866bf680…

MALICIOUS

PDF

91.6 KB Created: 2021-07-02 09:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4429cb7f17f89e6a24b84ebe2c3d3769 SHA-1: f62004fe9fd54377fe9f3192522591c1f8f69e4e SHA-256: c40d4531866bf6804ebf0c0aa922171edfb0c150119ce2cb685aa9bf4ea10724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cefccbc019daa0edb26a2d0bd3f70dd6/xefafesazosopowuxinimile.pdf
    • https://mamap.in/ci/userfiles/files/35842898033.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/ruwonagofekovorabetono.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ladc8jiqeqd18eo7q07v5gush3/43561993255.pdf
    • http://2m-m.eu/userfiles/files/sunetiwulesazujoniruzime.pdf
    • http://schokobrunnen.com/idata/junuvavive.pdf
    • http://sciattella.net/images/file/vizupujamovalu.pdf
    • http://viajesalaos.com/webroot/img/files/74991438313.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609058809894a---63546442440.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56097c2f1c---geneliwuval.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cffb1258---11700587614.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/be8e190dfbe8c7f6c59f98382bb73dbe/vadujadinajipe.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/udsahcj4jv4pk2plhihg5fkpf4/1652347294.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6133fc6f2ee9de00c39af47e95a9ef6a/85559315455.pdf
    • http://eotp.info/sites/default/files/fck/file/zibekanorexiworuxite.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/vimexosinubotu.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094755070d03---11823693897.pdf
    • http://asiavent.com/UserFiles/file///musit.pdf
    • http://location-venise.com/italie_documents/files/89186975339.pdf
    • http://edgecs.net/documents/5585395024.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607413449e518---jasewuku.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9108574016ed542bf073ca3f2cfcdbad/getubapesito.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/wevonoxegoripuvupe.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9r6mv7des7rfc37flcui9rvpor/pesivuruvimufilawamakaga.pdf
    • https://tort-art.ru/userfiles/file/kupomevofigoridapix.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/28k06ijjjpdnibe86bbq3pvd46/xijamejukodavisu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quotes+about+brother+in+law+birthday
    • 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_off00010302.bin
65838d032a3081456ff3c42d451e4439ed6dd34eee9c39fc2a157b9208c24cbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 17244 bytes
font_01_sfnt_off00012f64.bin
8f5561abb19a666a83e9aefdd217d1eaf87c827c969c3a1c18fbdad7fed661d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 10844 bytes
font_02_sfnt_off00014887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14887 16792 bytes