Malicious PDF — malware analysis report

Static analysis result for SHA-256 958ab30d091a67c5…

MALICIOUS

PDF

124.0 KB Created: 2021-06-29 11:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 736df53711aaed1b183061ea582bb38e SHA-1: b4468191cec3ffad273c57086e161b2166f94858 SHA-256: 958ab30d091a67c5969c784500954151d1785065490aaca6f6e797a5c4ad18fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the overall structure suggest an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=mighty+med+season+2+episode+17
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfea91670---61504242392.pdf
    • https://protradingindia.net/userfiles/file/53895638989.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a7d28dc5---45258271415.pdf
    • http://aihyang.com/userfiles/file/kakijiwuzu.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b643d1807d8---titulimewawewigodopef.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/98f40af34d1ccf7339c25b98fe111291/vibobenegovudebininexuni.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/26750726582.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c07f3b75c0f55b6ceabf0bc46dcef1ba/83569486791.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/rowibesazolawapogewavibe.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fe8cab2909484dd641edd9049768c785/38968455222.pdf
    • http://klinok-saintp.ru/files/xogugunilesux.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc77589d5---39541963175.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706b3c3ecd4---valuk.pdf
    • http://richmediahouse.com/admin/uploads/file/wugexolerobexama.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af99ae82540---44959241208.pdf
    • http://merrygoldholidays.com/ckfinder/userfiles/files/lexomirasadokomulur.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf2a53992---68065899952.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-17/20210517122930622242.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6phkh2l4nf7cedu9cusnuv2i23/jazeragowum.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073acd174733---27233991623.pdf
    • http://jpind.pl/userfiles/file/nalela.pdf
    • http://supermarketdv.ru/files/file/7290051368.pdf
    • https://cottonweb.net/userfiles/file/18353773901.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ee93baeb5---nagogibapax.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_off00018449.bin
251bbd91f6c22bbab1fb1bced7eb906c15886691b8218ae2c0ee319c4fe1127d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18449 17284 bytes
font_01_sfnt_off0001b14e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B14E 16792 bytes
font_02_sfnt_off0001c965.bin
5866309310ab88d26f3cf109729fc684185cd2a23e1bd69ea8bc2f2fbb3d3f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C965 11020 bytes