Malicious PDF — malware analysis report

Static analysis result for SHA-256 e935592b21e6cfe1…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 07:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 865e169ef6fa8a07182dbc9c66f73199 SHA-1: abc35040025733fc4592f2e01140c49c9d789220 SHA-256: e935592b21e6cfe108cafad90202b559dc877887b94dbd02274399a5b0c87143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure suggests a multi-stage redirection process designed to obscure the final malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://piau-po21inn.com/CKEdit/upload/files/pirivumekug.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097af36726b1---84550851099.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/61409012660.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/cce0sj5ca3u6kvolmd2cnm9278/74535536396.pdf
    • http://shs1977reunion.com/clients/41590/File/59610529164.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ad407686933---zazigedoxuzetisivigovar.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ks973hoj6kv8h0jdg8pn9vo5uk/jovetulofasebizip.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1299ccd01e1efb3ffe3b3a57cab0600e/1966824666.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8025cbc65e---xumabudipu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e7d54c9ed---85832181918.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8i164i9dq4kvklm59bkmlh6c29/jenawetemix.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jkt8kf6671sllp5h3j1ec63n6v/lezinoloneduxezoj.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9a179e95---murizokemox.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f37a93977---31967112629.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3dd44fd77---dunufipapixerebaxidevumo.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/4ullmalua154jsg5pc8el1jd44/nixavib.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/0e621ef93ac094eebf274fa82ef28533/31575796959.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/31985182777.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b496de230ba085074a533fc95290d63c/29552203784.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/56521739867.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9c2cf96b5d074dfa87fbc7294f66da76/314210547.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/58d038a79e4786e630f3bdaa1c1711cf/gavademuxokeme.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pinwheels+with+pickles
    • 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_off0000e896.bin
d0bd604f75155f57046a82070b37a3ba99cf4a3a12dcf07e687a91c68d277870
pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 17188 bytes
font_01_sfnt_off0001157b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 16792 bytes
font_02_sfnt_off00012d92.bin
60f7967dd9111d0b7f4de285f555b7675288821e3e6eb37e5b0582bbe59ea60a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 10268 bytes