Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb39a9f1012785f…

MALICIOUS

PDF

182.7 KB Created: 2021-10-11 01:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a2ceca4a1227ce290aa30d2c2228830d SHA-1: 52b3880fdb94956ba06d7fdc8e98d516376fa210 SHA-256: 0eb39a9f1012785f73f1fa799dc9810b276b05612e6138d41694188986d38b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=vail+company+recorded+the+following+selected+transactions+during+november+current+year PDF link annotation
    • http://mytrangroup.com/uploads/userfiles/file/68316061899.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/satufewumepawalena.pdfIn PDF document text
    • http://rs-entp.com/upload/file/34278272719.pdfIn PDF document text
    • http://akafgdsgreawy.pretty-match.com/upload/files/3860957130.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210923_9F320FFAB4B196AA.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8f7928f4a---32570887192.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/85418391945.pdfIn PDF document text
    • http://roocenter.ru/upload/file/najepiwutekobizikerufode.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/kotasebogowadon.pdfIn PDF document text
    • http://rs-entp.com/upload/file/10681350129.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/82013305480.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/817cca1c4363690ea967a72abf676c14/31858049704.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/15650824743.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148271a46f57---pekom.pdfIn PDF document text
    • http://ativn.com/upload/file/89857659144.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/35478481259.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/kuvosimubulo.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/xetekuleligo.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/45413868676.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/42150421510.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/70384638094.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_off00025faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000277bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277BC 22116 bytes
SHA-256: 201079416626ede383aa058be6f5d6e40b11ddde8621a0bc5e6a396c3052d2ab
font_02_sfnt_off0002b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0E2 11544 bytes
SHA-256: 6eab5339ba466a327055b7b9a697206012db2e7e84e32b1eda1f0ed4f3b52992