Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd314fac5867ef7…

MALICIOUS

PDF

89.4 KB Created: 2021-07-16 07:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ecf2e69691854aadf255b3e710781d8f SHA-1: 2661e854171c90640f230837de963b218bf0e385 SHA-256: cdd314fac5867ef78891423d0952cb5cf328779e83c70d0ab66a938bf2862d1e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution. The presence of external URIs and link farms indicates an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829d2367796---gaxafodan.pdf In PDF document text
    • https://ctners.com/ckfinder/userfiles/files/remasawevofexakuwafakit.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/banexetabufifogedak.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d7d058a72---92459134933.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210625092652.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e58f29b24ac---pakev.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u2eefste8dt07nmaqti7ecaq0l/vunonipisowuturiwiputukin.pdfIn PDF document text
    • http://hevolta.com/upload/file/98603054606.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/lutapikovuraximob.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f9a648f1ad81993a4e562391ddbccadb/nexepelore.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/22190960767.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/jusuzemukugezudure.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8a8e675f9ec3b36ed58251644231b923/13117992702.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/73011029323.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mailak0m1l3over1gvvrb3f684/wemutas.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/50155968473.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/vilewedovawasev.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2b2893d75c907bb75af9c5b7e092b18f/tukelesiwosonaxo.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7a91499bb0ad7dd4a67df8d96057b126/17902063721.pdfIn PDF document text
    • https://afayl.com/userfiles/file/jevelulafugagajokatezo.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/gawebo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1b5ec6a7---xiwawalenalejazuxalejewuz.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/23902106393.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46efead5ed---71320411654.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/6426721128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=martini+gin+and+vermouthPDF 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_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 10640 bytes
SHA-256: ea2969de440d41c769b75fe692549325a48b8b3692979d694a4c89d677ac4129
font_01_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 18236 bytes
SHA-256: 42d3b887282b7ff08db4d94ce902163dc3fdc62cdbab154813994c7ff28f4831
font_02_sfnt_off00013ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1