Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d0a4c0e46fd615…

MALICIOUS

PDF

102.7 KB Created: 2021-09-02 04:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 712b77ba0c3a2bb6f38a57e69cfbfbf9 SHA-1: 7e374b3438e842b979d97f91b2d3c459d2150b4f SHA-256: 24d0a4c0e46fd615be36b1357ebf304cb21b56b793a1b3443ed4f50273201869
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely to download a secondary payload. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic strongly suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608189dcc5c82---porozitadagejomo.pdf In PDF document text
    • https://tkquiz.com/userfiles/file/85264036124.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827fac05a14---8996772173.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cff3bd9d8---1051499095.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/s8al6anu32v3a0mciv2d75c0v2/meledep.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/gigitawu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/14619408781.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/zimopiro.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95b71d595---regigimolijubofifukatipag.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210729_233722.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/51233242766.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210616_3E2C09B3C0AC3B43.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ckpvfasr9ub58u8dmbba2o2221/17031209556.pdfIn PDF document text
    • http://funperm.ru/content/file/kopusa.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/4359462964.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/90157996088.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/43401606892.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/xagekutedenemawivasulo.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/7781218046.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f73d7d6ed---72194965335.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0b84pkn4icl8mhqdljd1ijj9hu/91096762641.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8fmp85rj7om71kmm4qkgk2p4qp/tonojuware.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2bd5b82---14001187079.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/molesevatuwek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gk+today+current+affairs+pdf+downloadPDF 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_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBA 19728 bytes
SHA-256: 1878a1bad955c59b3055350ef7e261f77ddfc6b4f71df2f146934de9fd479f1d
font_02_sfnt_off00017052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17052 11044 bytes
SHA-256: 14c97ddff14b541af6dfdb673e78afe2c48f8c3fd33202868cd2e583b1dfb6c6