Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdab071f657f4d0…

MALICIOUS

PDF

90.0 KB Created: 2021-07-02 18:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6f9199196b719765e20ec43a3d10f45a SHA-1: 0cc060fea2842c4385b2331ffc82f8019e968e5c SHA-256: bfdab071f657f4d060fb5fc927275d5ae44e40cd5f1796ee3f3ded692310e19a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest a phishing or credential harvesting attempt, potentially leading to further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=graphing+ratios+on+a+coordinate+plane+worksheet PDF link annotation
    • http://www.aadhar-interior.com/userfiles/file/xakunevunumexawakapame.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c72e17de---90587707624.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/39689188378.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/74151517409.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/nigusuxozojuvuge.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b700e3f846---8452280283.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c41cbcd1b---35224949026.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7a013f7bfdd0a49c2d650159410e1974/gopegalisajufipuwudasozup.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11eb77e84---26637512986.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1beb4ae6e6b7410f4e7c317a047cdc2e/5277354803.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210627110537.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fexuwilarazuguguzi.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/lokeli.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f7059a1fab526090388d96c6c41dc7ca/revexi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc9e776f4a0ad3a9b0907f16f75aa5f2/dalaxipozibixakipaju.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/3039494989.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9a4d11f7---59914768964.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/26373234555.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00ffad58e---lulevunabi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/pshl6tvg83ui7hseqa2ho5hv1b/rakosalabanoda.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623822683.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/91294099404.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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 11008 bytes
SHA-256: 9d362b3e11c16f18a71f59c2b182c9255e200bfcb6b3b111bdd393a828b015e7
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 18064 bytes
SHA-256: b7a2ed9bdf4b9cffc36eacd734d20e0451cdaebfa0a5406133ce6fd2bf727323
font_02_sfnt_off00014297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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