Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b9f02af1e1638c…

MALICIOUS

PDF

77.5 KB Created: 2021-08-28 11:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f450fc91e42192253be1cdfed3fc2dbc SHA-1: b4b74ed8e298a418628af29038bb6c5fa20741b0 SHA-256: 33b9f02af1e1638cc548121eaffd314ad3597e6d52e2f4c3fb1dcaa44ee198b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://peintures-descours.fr/fichier/files/gokumuveduligabat.pdf In PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/xirizelewifol.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o44n16c0s6la1v7s1hg83u3cr6/dovoniz.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/50056134617.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/74720755393.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/15740308669.pdfIn PDF document text
    • https://renetravel.ro/images/files/53407515583.pdfIn PDF document text
    • http://masihpt2.com/contents//files/zexokulaxasixido.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/40530639641.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/611108d729b2bfa2e412e97eb9ec2a35/71101474215.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05eb3304cf---1441012158.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/nogudipedi.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/mabiwof.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/78976890623.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/renukolebive.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/81375974984.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/rodutibaretakemoneveve.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ggfv2l1bcsav312lit4kcdjtt7/85386176413.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/17426470558.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611014df736db---45307926046.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/jqb2k2f66h501mqhfrv86fmhmv/28616555828.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///pixupaxusixavaxurogami.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0744a60ed9adf6f66adf5ad71fd58293/nevezerejen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=about+future+perfect+tensePDF 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_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 16620 bytes
SHA-256: 677d3fb7deb2fdeae47d218f576ef68c0b7f934cac03e569cfe757617b9d66b0
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 10396 bytes
SHA-256: 03b78cc4bd6fe35c4c1c54270c46dc6e7b6ad952756c733cbdf321c90933ddc1
font_02_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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