Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58317eddd6c8082…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 02:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 862c26852b6c616c01168e91a0fcd777 SHA-1: d5fb59f988aee03f2f52a84c89e4d69e31955c02 SHA-256: f58317eddd6c8082265ef963d1976d1880f5e12f90d2e804b307718d246a28d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to potentially malicious websites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://hpmcfamilyreunion1968.com/clients/83891/File/birepojatutod.pdf In PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e973fa06d9f---gidatizabobutomoze.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/fa980bd3940d759ae15e1aae90cf4f6a/92748891538.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1401_20210520210648.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/13508583848.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa3a161ed---75416803758.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/penapute.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/79641259631.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/rigarizufavuxati.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d8c15fb6---84454565885.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/womirug.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nisovavonam.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094822920285---32564379608.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/32705969329.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/9365411002.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/95361856675.pdfIn PDF document text
    • http://stl-hk.net/userfiles/38201655138.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/jovowapugosaxobejewu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/10330149778.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70c49980e---mevapileladurajetite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=far+flung+meaning+in+englishPDF 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_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 10520 bytes
SHA-256: 35729031b6cdf146a6afc51b51702582ea1bd3f37ec03ec9c88f43f1b8d750bb
font_01_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 24280 bytes
SHA-256: 29b46a533cb6498c6e9b3fbc23cfb820c3963941f334755b42da9d57584c4b4d
font_02_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1