Malicious PDF — malware analysis report

Static analysis result for SHA-256 334f3fd9fe28b966…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 19:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f7edced974c88803102ef1fc402a47f SHA-1: 4a3d704bdc417581e8ea313992e92489d6ff1017 SHA-256: 334f3fd9fe28b966931b5e70cecb72f90064af868a43280185264e2a66bb2c89
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://archism.ru/uplcv?utm_term=list+of+all+acids+pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c2602e67---zinexogitafumakovew.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/4325660473.pdf
    • https://aartipalette.com/userfiles/file/37093021773.pdf
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/luribidevomefafu.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/e8nmejrk8nhk816ld6a64mpuls/39214109559.pdf
    • http://posekatzahradu.cz/files/file/bumediwotifobav.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b783e1f0c5f---96011077610.pdf
    • https://baobihungphu.com/media/ftp/file/fapijixowevafep.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa323691a44---jepagazaxulenov.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609470a9d93e6---wilativojomagituwajaxisip.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/768047da7912a1bc893fd958d289adfd/11005724985.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d0a052409f20df51a2dcc9017bca1080/92508618483.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2d489g1j2m5ljnk5imi78pfddo/burivanezabenujalod.pdf
    • http://sp3siemianowice.pl/userFiles/files/27199703729.pdf
    • http://bbmpva.nl/fckassets/file/97541483078.pdf
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/97903757489.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f087300f2f---xupevovotitenubigatud.pdf
    • http://valeneighbors.com/userimages/vojojapodapeb.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210621015009.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831eee50791---pakife.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ace313e1---38363036776.pdf
    • http://ozona.pt/wysiwygfiles/file/lufaxoga.pdf
    • http://sp3siemianowice.pl/userFiles/files/mojugisowojawabaliwore.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6291671db---mofewuju.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_off0000e56b.bin
68a62eb4893a895737d61ed380c9f31739b62c7056528b749c8726b3f3fee85f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 10232 bytes
font_01_sfnt_off0000fc8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 16792 bytes
font_02_sfnt_off0001149c.bin
4f55e779c4d2e863b57e6cb04d0de4abb1bbd21b8998c79dcf71a1578f3edfe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 17656 bytes