Malicious PDF — malware analysis report

Static analysis result for SHA-256 c310ff9646f04e86…

MALICIOUS

PDF

74.6 KB Created: 2021-08-26 09:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9525442b645f000770354c78cd272073 SHA-1: ba68dfd4178bdb3302a6b54ba3b82ce98f54a66d SHA-256: c310ff9646f04e861d60600da7f0ba048a231c3ac8242d6b8b6106f3c8642314
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload directories and disposable hosting, indicating an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous suspicious URLs suggests a primary function of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161048321e002f---18106823884.pdf
    • http://pnmanagementsolutions.in/uploads/vujomusajunotenozej.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vubewowujojerasoze.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a439ff3c447---69279165581.pdf
    • http://atek-ent.com/upload/file/34674749780.pdf
    • http://artpolinakuzina.ru/pict/file/neluzuwupanulu.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/gijunisepulomel.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/gedomimedu.pdf
    • http://crmloccitanecr.com/campannas/file/zuwati.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/cfdb967faf001aa42bb960f1d949d0d8/25487518961.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/33678434106.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/60617575706.pdf
    • https://thefertilizergranulators.com/d/files/83057544730.pdf
    • https://mikludava.lt/images/files/24239542638.pdf
    • http://18554080.com/userfiles/file/logubuvokutufuxamesole.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/45579672991.pdf
    • http://manavpublicschool.org/manav/userfiles/file/bifopa.pdf
    • https://aquaprosmart.com/userfiles/files/78632786057.pdf
    • http://villa-margherita.biz/userfiles/files/76593011332.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607432d23a27b---33478130865.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b1427b8237f1cff5235e58b4daccaebf/34751003549.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=one+for+all+urc+6420+manual
    • 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_off0000bc0a.bin
3510a6a385951b5793563a2d3598adf9ac33d17506045367b09a54972c266ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0A 10752 bytes
font_01_sfnt_off0000d4d5.bin
6df85132cb0db017bd7a50315a48cd04559f3a18ef24ca971733f8deeb17075a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 19796 bytes
font_02_sfnt_off000103d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 16792 bytes