Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d4eb33a3c2ac63…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 14:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3bd8c544330b53056ce39c62fe3cd495 SHA-1: 0400e814233bd2193b95ae8fd4dca23e6ed5f551 SHA-256: 92d4eb33a3c2ac6357a060a2ad2cee527c2d3c16753475faed95545de0f44a7b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://principesgs.com/userfiles/file/sigoditezonijorox.pdf In PDF document text
    • http://qianxish.com/ckfind_image/files/tagemuvewenenov.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/lofabulebuxuvugis.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/45aa902ef6a05739b5de3af74b568a61/43029647109.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fhovdmvdr1ucqbrt4fd0dkiap4/67466919080.pdfIn PDF document text
    • https://banghenails.com/upload/file/98886887746.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/pepegimajemoguvorunasoli.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaf4e3abe---nelukeguravavuzakegunewa.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210625105636.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/65972850890.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cijc1mc5iv6hc4688q6aoer4hb/mujajuperirakifajapajowop.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd3e76262---mazozizanilesule.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kakifaxinaweje.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/baguwot.pdfIn PDF document text
    • https://puntoagricoltura.it/file/25736119436.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080def506bc4---kiwaxodopesop.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gifeko.pdfIn PDF document text
    • http://kme-kme.cz/files/file/bibowujadumezepasurasum.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/19413564143.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78ea1f2f4---suwuzatemikewogesim.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/79660717342.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071704bb179d---vujarebiforobeb.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/bizaju.pdfIn PDF document text
    • https://kimcert.org/E/file/kowozije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=robbins+patologia+humana+pdf+descargarPDF 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_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 11352 bytes
SHA-256: 4eae8a119023851ca47b7cec5d7e19f03c23bb6c591dd4f02b1b37c645a48513
font_01_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 18400 bytes
SHA-256: 3116a432187f30c01885c4f93cc17e712139c604eab1bbec2ca2193a57b02da8