Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02d892987bb2cc8…

MALICIOUS

PDF

102.1 KB Created: 2021-07-03 08:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3843f21b3909abe3a150ee34c10d3b0e SHA-1: fea9effb6fa7a6e53d00cef4c83252ff2bd0aa90 SHA-256: c02d892987bb2cc8cdd07c9d0743614a2539196fb81f3e6123c2d63aeccd9884
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

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://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d48cdfe7cad---55079932094.pdf
    • https://artenika.pl/fck/file/pawobevewebevo.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/fagitepenelo.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lkdsss0o27jaljqbdok6o24rd6/bokigizaxodilajag.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/urnbu3dnfudipehe9f709pbpa8/gopidumiw.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/8679133948.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2d823e8950467e96f94cfd7e12dd40b5/xufewu.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/066de0859d828a4bc369be30137bd7a6/fitad.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726700de7d4---9932328269.pdf
    • https://marmarases.com/upload/ckfinder/files/deziragapojazofetepen.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791a93a4795---gebige.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb67019eb---gezufuraliv.pdf
    • http://lawngo.net/fckfiles/lugas.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/amhellkvjqfc559523trmoa5f3/natifeguranalimubogo.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc478996a---xenusovetavaxubix.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4b4bf1ad---derarefibatex.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806faf9cfab---78031300803.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aff13cb8a37---vosaxexakuruvaselaje.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/e2ta0616m74613i86f1vhiaska/99969864806.pdf
    • http://mywymc.com/userfiles/file/48103647156.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/wuratesesinakop.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bbe915d3331d4b943dbef98ee2b11380/suwufuxewatobalomejedo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=peter+drucker+on+the+profession+of+management+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_off00012928.bin
6b6820b0549756296cf0e9f99bdd9a68b4b273acf6a1f63bf1a317f85ec162b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12928 18528 bytes
font_01_sfnt_off00015910.bin
e2faa2e7a90055e51bfc0518398f10713b31715d42206c2a0431a7035ed96949
pdf-font-stream PDF embedded font (sfnt) at offset 0x15910 11216 bytes
font_02_sfnt_off000172f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x172F5 16792 bytes