Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b35ad3f0b31d32b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 14:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07a99fbe7f59de57bd594afbfed9047e SHA-1: 2cf7d01515097825dfd9464a99744da3dcea1411 SHA-256: 6b35ad3f0b31d32bcf75229daea16cb9218829085ccd19313fcc5bc59f8d703a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://marblobath.com/app/webroot/img/files/bulibesasoxevoxagurer.pdf In PDF document text
    • http://mobiliteit.nu/files/34253128046.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/27545828641.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/ruzivedarijodelikod.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/jazenade.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2acf76745---21552862778.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/bokovupedasugenewibut.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161306c1898a13---88341994247.pdfIn PDF document text
    • http://etnorom.hu/pictures/4577039857.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/58840239845.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614320f5b056a---nilujakime.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/90638533619.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/9248580914.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/61462106440.pdfIn PDF document text
    • http://newworldss.com/uploads/file/99394677839.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95550834480.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/1362222201.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e52463983---77373713057.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rgdkl2vrhs0um9k8b02347gc26/36073331273.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/95274416249.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5c503899---52227436686.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/maxakalonon.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/julitosoxonuzotix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=translate+site+extension+chromePDF 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_off0000aee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE6 16152 bytes
SHA-256: bc6fe1b46af5b1ecdbbdebfff48c38e3232871ad3be1e7f5d9cdffcbd7e115c9
font_01_sfnt_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10560 bytes
SHA-256: cf2e9d42126c7469f63684da4730082964293a558e8847d4d0c651f70b522aed
font_02_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1