Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3d17f5d2ce2cdc…

MALICIOUS

PDF

115.8 KB Created: 2021-09-04 23:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c05b8829aab98fa96afe75fa7121d6a6 SHA-1: 66b2fbc58a2ca54500fa9baa69647df900db894e SHA-256: 2e3d17f5d2ce2cdc23cc8e39cc0b63246dca1f914e994d3f8ec0865bd166f0eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/dfb7d6e80b40c8ff6150cedd59efc1ed/joponumadolabukug.pdf
    • https://anctools.com/ckfinder/userfiles/files/fizonesusebuvexalaxisaxiv.pdf
    • http://villa-carlshorst.de/sites/default/files/file/koxigidiniwejakuwekuzuzu.pdf
    • http://www.olivier-frey.ch/user/web/file/nejiveduloxofojukanisudaw.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e49b7633e5---sowuwuw.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/82003584001.pdf
    • https://tidaksusah.com/contents/files/13739003901.pdf
    • https://doluhosting.com/calisma2/files/uploads/kemofe.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/08p0blr9c7dtlqgstoc03u0mrq/44842880844.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079045bd12ce---tasexofemima.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/zewadomogutujolojivakero.pdf
    • https://northcoteplaza.com/userfiles/file/xiwubab.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d43452833---nazozon.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/83591421513.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8cq5u72fp9di6g029gphsac4o4/gikivatodugunawo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612babbc0f3a1---kiboboxeto.pdf
    • https://10glazsikeyrosa.ru/file/favedimowawinez.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/773413c094c7fb790f2b3d8addc86c7a/doxebuvataxotozizop.pdf
    • http://chinazzjx.com/d/files/19541873259.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/910bad9986d8fb0c3b1412fc3782d342/ganaburamegapobejixerupas.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee82ce5128a---suzatakobefapez.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4l1upjmuo613davumqvam6n298/75615653150.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081933112f58---julunovinerixuxap.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4489dfe1---57592848320.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/legigadat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=al+qaeda%27s+organizational+structure+and+its+evolution+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_off00015ecf.bin
670ab4d2faf6ed14b451d01a4cf11c70037ecc7869a4a1e7ef1e75b8acc5a6f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECF 18592 bytes
font_01_sfnt_off00018f0c.bin
24d95b7025d488775640a397387ade9dca8a280ec4e6f0debdde0fdf5bbff884
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F0C 11184 bytes
font_02_sfnt_off0001a8f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8F0 16792 bytes