Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb31c09f3eb0f07…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 10:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84985eefaba4169b52ab9ed9418b4c76 SHA-1: d3963527f9c8ef497e0f46f9751906c3523c9334 SHA-256: 5fb31c09f3eb0f0712f201cac35df78643af19cb25a846d044ee224b82e1a24b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=anne+of+green+gables+movie+watch+online PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/037320f6b7742776693a5f7471dfe67b/darevas.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c840b82fcb---bamasuvopalomofixagujete.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/josizuwuno.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/30c5d6327b8bde3307221dbc54ca10b7/gifawaf.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fce68a77a672a92a24d37a0a371a534e/33103054566.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/53553366359.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/76800545469.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/zonumawuboser.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/zerujulufutavavateg.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dapedofojinajanemagavejap.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/vemuzifepixofi.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c0e504d78feda5544957519e22ca218b/rawugafilepezevizefuz.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc544c26f---66542633054.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/84af9626ebebd601dce1ee5112a93288/39573024835.pdfIn PDF document text
    • http://artospace.com/pics/file/3560997893.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/gudutunerudemeku.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/40760776596.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/34663474078.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/842a6898d1a02aff82a68d7878b34316/41244275117.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3c7f3cd331698420eb33d720beaa3914/topavo.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/kdn2q8bru43j9janhsibapas65onp93t/fokuruduwapogil.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/fenoni.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/20061175644.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_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 11056 bytes
SHA-256: 12ec594fb1f840605fa2d0a68a24546f3f2a150e167d3fdc43650328c0df9c43
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16472 bytes
SHA-256: 2f8fa1cb911bd91750df4d688414d5eb4dc2e3c7e736332208ce701ac27943fd

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