Malicious PDF — malware analysis report

Static analysis result for SHA-256 3343f4eaeef7fbb1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 07:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cb7151982ef3c44490e3a4621f0c574 SHA-1: c6c244b8a6b671062b777351306079826fb4a3a1 SHA-256: 3343f4eaeef7fbb1b9ee266655da7544a704b9a7faa5602c2610c312ad28b28b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves luring users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pixomot.ru/uplcv?utm_term=exocytosis+and+endocytosis+worksheet
    • https://pointswestliving.com/ckfinder/userfiles/files/34788899313.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cc11e16beac669fdd0bc4093e8885aeb/42723305409.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tfsoa56sjhkltc7gng7ttn24o6/75759089911.pdf
    • http://chpcentre.com/files/file/57282084216.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5ad5ab5fb---jagose.pdf
    • http://oilandgaswork.com/userfiles/file/gedote.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2101744c8c0f15d1fcac14d41e814a71/jupizasakejefumamugevu.pdf
    • http://altaprecision.com/userfiles/file/febenoda.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/mekalipawawudajuweme.pdf
    • https://lockerova.eu/admin/upload/documents/55643524557.pdf
    • https://sunarchegypt.com/userfiles/file/98411054073.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da89f001bf---nokuwitoxobise.pdf
    • https://alajuusa.ee/media/contents/file/fabovavabipa.pdf
    • http://maristaslardero.es/userfiles/file/9659671968.pdf
    • http://beamstraffic.ae/amb/userfiles/file/wemeb.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gccfmn3a9aej81b30h3p4kjfvf/barekafegukuf.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3937593a4---32497118525.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4ce7f57d3163fa42f89b525d14bfda7d/sibaresewosokijurulat.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/14411023661.pdf
    • https://bd-sokolovska.eu/userfiles/file/22335112971.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f74a5489---jopanuj.pdf
    • http://hbleg.com/admin/userfiles/files/wujuneparurijesivowitukaz.pdf
    • https://cgeminfos.ma/upload/file/gekeredipekilabilijig.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_off0000ce8d.bin
db0dee4de41a983ab246f8879ee60361da11a5f13d01f4584fd784e1ac723241
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 17164 bytes
font_01_sfnt_off0000fa29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 16792 bytes
font_02_sfnt_off00011240.bin
29b8a0825e9ecaa3215c94c704f9d7cac4ba9bb9eee538f27f5c91baf881cfb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 10800 bytes