Malicious PDF — malware analysis report

Static analysis result for SHA-256 77286a357ae6efda…

MALICIOUS

PDF

75.4 KB Created: 2021-07-05 22:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2d22d12e570678f5e2e014110de2430 SHA-1: 9c0c0e0de060630cd8e6c9bd90bca0bac8ee93cf SHA-256: 77286a357ae6efda29d6b534f2eda5174e912377713a8c9e983eaf4df2dce0de
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://argol-editions.fr/userfiles/file/36877194462.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/dbaaa45e53b8f8b1a2fdcccd4e3e8e3e/kipuvagig.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/027b50500f08800b9ee375134d8832f6/noxodetekafelujukaju.pdf
    • http://abwmarlboropike.com/uploads/files/18128871579.pdf
    • http://asea-admin.com/_userfiles/file/20210507174913.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7675a460---niwev.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d96b5ddff7d0c0fa2d715c4650e84a08/38007740631.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1cd4fffa---37304801055.pdf
    • http://menafundinfo.com/userfiles/file/tepitewezatogidasegib.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d8993562---58494105883.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d8e22db61---55146601096.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe6568c54---68006966442.pdf
    • https://viessmannboilers.ca/fck_upload/file/gigagatixi.pdf
    • https://flardochform.se/userfiles/file/mafojo.pdf
    • https://gulf-rope.com/images/bulk_images/files/zufaziz.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/mevepawuminuwotekani.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af0ad47a5f3---tavubajewadejujok.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a65326d38---84335729077.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e6f31bc4f---66715280831.pdf
    • https://zakarpattya-tour.com/upload/59101244665.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa1717a59---pedevodedegagen.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lmojg8dpp70u7so8t3q0i6rmmt/lawamirurefewadofiwomevi.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac5e6802ee0eebafabaf91a4f06da85f/levuliwaboruti.pdf
    • http://studiopignotti.it/userfiles/files/kukosek.pdf
    • http://ttc-investco.com/img/files/juboxajaxojazep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=elementary+statistics+a+step+by+step+approach+answers
    • 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_off0000c1fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FC 16792 bytes
font_01_sfnt_off0000da13.bin
2cfd8172841404f90d62b23d26abed30b902bc2a6444c8be6ff4df1ea05a50d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 10960 bytes
font_02_sfnt_off0000f31d.bin
f2abb39691723e1b6fce1588ac17c93aabe91909483d54978eee19ad49de5779
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 16480 bytes