Malicious PDF — malware analysis report

Static analysis result for SHA-256 349f4e3e1c63e51f…

MALICIOUS

PDF

90.0 KB Created: 2021-07-25 22:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d95d09a83788c56829e2283f4f3f586f SHA-1: 6ec6754019a79c0784ca3fd780fdb0a5e5bf083b SHA-256: 349f4e3e1c63e51f41daaaf991bbdd2886a45e8ab7975b3ec13e29cf1ec31710
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories. These links likely serve as a link farm to distribute further malicious content, such as other PDFs or executables. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://debeleven.net/UserFiles/File/gowikifitotuberadidodi.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b23cc44a8---tavikovugutufegirosexalu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35304534e---reditapu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5b2131c1c0e789d36e84db0a7a3c1f98/15968652200.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d9c9a767ed0929567e90c05e59d107a1/11345417592.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b536c68990---fuvid.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07bdc18e6---vozesusakuk.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d6c371503b5f295c5c56be049df89e1c/medelajorepiz.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/98786765982.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/12319862781.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nokugix.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/lukuro.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/88249389422.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d7e40732160cd2d4fb89a5e37ff9c1ff/mevumizezeval.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6e9ea8a0---vegolises.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9ab086e49---65295744267.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/38357574231.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/34539319746.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/76865448288.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8db8592b5---86157113148.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072689fa1b0b---molataduxi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/majazud.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160793813f1ab0---14807246654.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r6ahb0ehi2re9bnogphk6oj390/32008322904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=algebra+math+worksheets+grade+8PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 16840 bytes
SHA-256: f0e2d99349f5238cba8e2cb55d92820b8ee2071d953be3ef4c8f300eab2035d3
font_02_sfnt_off00013dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFA 11008 bytes
SHA-256: 3375e382c8b0266cd8c6a3a8189f31c1ae907ae950b73fd92a8b68cd9df64baa