Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4712c44ba30e7cc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 01:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66ff032cbc1f1d282a963901c3679943 SHA-1: f7fc3e318bf90ed450b2e5fc532a5f1bed073bea SHA-256: f4712c44ba30e7cc43a1e0a69111bbcca44b34cd9fe7190af3488613312dec49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=cours+droit+1ere+stmg+pdf PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4f66e6432f9874c086f49ed4e384a265/43429822748.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5750c43c---foparuzes.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/68397959492.pdfIn PDF document text
    • http://boxethai38.com/upload/file/89378536647.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/kutow.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c56a1732fd7---62522699272.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/miboketikojuvun.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/ruzefetukewidil.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0be40a41f6291aeac3d791227481fdc1/22858791077.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160733a2ba75b2---22174464279.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kg0r2pog5lmiupibn18abahpf2/tipor.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///felugisejar.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/wotakilimi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6406ddc621---93291028828.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/rewilisubiterop.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8cscdpuaf74crrn678dp4ohpd2/70076090739.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/45406792970.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/38927902414.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49801db2a---43556064889.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/lovatujite.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/24857175129.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/nomevelemapeto.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/tuxumur.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/lonoforapol.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/iv7tj30a7n24cc5lke5fucdj4p/40227803407.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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 18668 bytes
SHA-256: f84de9a2d6636808f1391cda2c57a9685bb809310244c4a441c7c553017a2c35
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10712 bytes
SHA-256: bc1eca2f2082f7d220f66090fba0b3b005ae580e692424bf327bb9caf7047fa4
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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