Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e39fc5590d2c08…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 07:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09a9c6f1fbf7d323292fd3e62d5bc26f SHA-1: 2f52bbb5cbb1a6899854f600e62fd65f0413b77a SHA-256: 79e39fc5590d2c0874a1816273b213d3a202dfdb4e41dc4eb763a582278f4439
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=guidage+en+rotation+tunischool+pdf PDF link annotation
    • http://beiwendq.com/userfiles/file/vijimokipepidokugujapole.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c0deba2b---jijebivago.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/bogopirolukifas.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/napeferovadanenazu.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6130aa7d59df5.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/18983475599.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tlqmidj7v0k140cfl9mrd3sqmb/gukujixas.pdfIn PDF document text
    • https://guijek.com/userfiles/file/16875446114.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/zodenesasebulerav.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pipowefij.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/9g7g8flc6ss8etr085am5c2sqd/46493804308.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fb86141f---20000714252.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/95028368893.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/kopuno.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/71287362751.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/68621609630.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/53436982095.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sq6h27h24etvgdd8eq89dr1u0a/pimudamukejegasaduvasereg.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/napedovi.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wigasotofuga.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45be28bbb3---tabat.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_off0000c501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC501 20072 bytes
SHA-256: 5e3b672e3c2c7cdfeb4b8f97dfc584e452fd78922beade76c2ca9edfda06c1de
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 11036 bytes
SHA-256: 3276455ed49f5231f1af22c0a4818fd4113daf5ee6e3a4a2c9f4bf337b7de42a
font_02_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1