Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b192a91ba46a9dc…

MALICIOUS

PDF

68.8 KB Created: 2021-09-16 22:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01b9e1f3f34195a3ee9748d7d6fb5f6f SHA-1: d473c9570af40052788a404b847f0475d7659ee5 SHA-256: 8b192a91ba46a9dcdeddc30824d18d87a76f0b695474db5a5222ef2205e8c477
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=schaum%27s+calculus+outline+pdf PDF link annotation
    • http://dubilex.com/userfiles/files/42383984319.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ecea3136fdced8eea0e8c4c66f57013e/nojap.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a08edfff---duwaluxen.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/66961746164.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/40978430320.pdfIn PDF document text
    • http://isvpro.com/custom/files/83142951503.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/55846272349.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/ponivigodebuvub.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381efea2fb8---jadubisumafinapo.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/vaxovexowe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135045c3e799---pukopaponidivafeti.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210909055148.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/77212468823.pdfIn PDF document text
    • http://badgerhillfarm.uk/jisilevisugef.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/52366739799.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/gukoripam.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcbc6dbf1---xefuwumurage.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/85994776949.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/sijujoxiraso.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mugekujilidi.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/50615885862.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/roduwepatiwawagig.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/68465605243.pdfIn PDF document text
    • 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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 10992 bytes
SHA-256: 3c5051396e4d92f7c80ff16fbcd91ccbea0e9bb666a9a463eb2ffc484eac4a65
font_01_sfnt_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 14384 bytes
SHA-256: 96efcda4b42de99106419e3cfef9dafe5a7b09a607e0baf80bc49772fa9b740a

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