Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f137750fdba6dcc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 18:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a82aef87224c3bfe008d07df35abe203 SHA-1: 42e2df7c39648137a0d64e3711db99ea9582daac SHA-256: 1f137750fdba6dcc65535017d83350073264a46d0ce13d2c33fb7a76629bcb12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL analysis point to a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://everywheregenes.com/uploadfile/qu26_qu106_com/files/davapavedeji.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae28c548cf4---ximazod.pdf
    • https://tannhatviet.vn/upload/files/pifafejejovoduvuxofen.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078a74f3f19f---43469981066.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfc8c9eb7---gurojobisexo.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a59c5ff333f3683ec518c221e13d220d/98085134487.pdf
    • http://ucg-eg.com/userfiles/file/8480043926.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b439eeb6ad1---47838240933.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1724a210d---59859780596.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/db421147af8041fcf743ffba50ddd144/sojidegujoritunapelugax.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d748daec---dogawozawuw.pdf
    • https://herfection.tw/upload/ckfinder_temp/files/20210620182427.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u5q19047q6kjici8iaiivfdu0c/basibifawisuka.pdf
    • http://sibstroiexp.ru/userfiles/file/52196723440.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fe35fd5ad41268ccfb5c74ebba5143f6/rivesozinuwusomipaviwuk.pdf
    • https://peperita.it/writable/public/userfiles/file/27171239435.pdf
    • http://capmar.eu/userfiles/file/dipotitu.pdf
    • http://hawkins-kearney.com/clients/f/fa/fa1934e8f236f3272fb98c88546bd003/File/zodijegofuk.pdf
    • https://coevent.ru/upload/files/sinafozoxexumamolijafatot.pdf
    • http://wingmanplanningdemo.com/userfiles/files/7243001417.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/54556223337.pdf
    • http://studioriboldi.eu/userfiles/files/96706784073.pdf
    • http://marthomaiticherukole.com/userfiles/file/44378119578.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/960736387.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manual+da+panela+de+arroz+britania+pa5
    • 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_off0000d9af.bin
14ff0aa9cf094bc092fa6804a0129c0aca5743871621cdb1fa182b4484242fc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 10644 bytes
font_01_sfnt_off0000f1e8.bin
477f90da84cf339e34c8299761352517d2faa3b7af493ad54702e057cb6f5501
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 20536 bytes
font_02_sfnt_off00012584.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12584 16792 bytes