Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad3bbbaf93b86e1…

MALICIOUS

PDF

92.1 KB Created: 2021-06-25 20:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee666c70109ac63c5d70b8d9e47e8c8e SHA-1: 3f9b0dda43875c809d636fcae50eacb9ec569732 SHA-256: cad3bbbaf93b86e1a2907c1d0ae4a02252120624122ee55f9a10ffe4f9da2f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and link farms pointing to compromised CMS uploads, suggesting a redirection scheme to malicious websites. The PDF structure and embedded links are consistent with a phishing lure, likely intended to trick users into visiting scam or credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=michelle+pfeiffer+grease
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c5581f4a---89814906920.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/05344ab19858666fb0315231581b65c6/76421824267.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/gikixoxuramorajizogi.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05524d778---butenoli.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075104fe50d0---45971133091.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d777be5e33---gelovujidimiduxotupebovi.pdf
    • http://dienmaythanglong.org/uploads/files/xigixegumubi.pdf
    • http://dansungsala.com/uploads/files/65865608157.pdf
    • http://nutrisoilvietnam.com/upload/files/89669983292.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fp6pv9quj11vispsdqcr42e9j7/7997860005.pdf
    • https://mszukam.pl/dat//file/44004468780.pdf
    • http://afghansolar.com/userfiles/file/movelodolumukiki.pdf
    • http://gapoom.com/upload/fckeditor/file/58603183207.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8ce07c6---37778306720.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pb13fbi2jn5cbb119p7ic6pc5t/30620389606.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ph329a2n4k9h6sas2vkf4ml3o0/2340390518.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91cc236cc---83886290120.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b96bce10---bavugodikisade.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/76b9524c265704dafef710ef2d27f6c9/gozogup.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/48001117056.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/63373213948.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/wadixiso.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_off000104c1.bin
d42739ece1857593311a6c9a18e58f7d9c2ca933db4bc011ff1e7334ce5bc748
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 17672 bytes
font_01_sfnt_off0001337f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1337F 16792 bytes
font_02_sfnt_off00014b96.bin
d051e66f050c0c952b2987bf4a2cf022aa557d6f10db910e763c98875ba35266
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B96 10432 bytes