Malicious PDF — malware analysis report

Static analysis result for SHA-256 df191dfa1361767d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 06:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9362be4d4981ab4a3a728b52e47875e2 SHA-1: 6128052501571180ad720cc89c7d2fcf952c3b24 SHA-256: df191dfa1361767d7fbe0ce64d283b9f3329a6e6ef28533a71739c885f3f5829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by ML and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to download further malicious payloads. The presence of external URI heuristics and the nature of the URLs suggest an attempt to trick users into downloading files under the guise of free resources.

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://nomylo.ru/uplcv?utm_term=free+download+supply+chain+management+pdf+books PDF link annotation
    • http://aftckwt.com/uploads/file/44707197961.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096838cc8ba7---44424174342.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/g3p3527pc7o9o6b4fodimg0gd6/padonunotoba.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1627714505.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/cd1b0e421850fdf92b374ff7fcfb626a/74831237013.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096bdce6af03---42245490381.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c4183ba35ac4f7cef077a93f70e27b98/wobebifesivekiwuwogomex.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/fetolugezorubel.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/40491756566.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/nevofegove.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e2c3885bd579e8651b2c131aa707ee1b/4233275079.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/tazelivurudubufoxum.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/37044746841.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/73ec06e4d1e9af557b3cdd0742ebc244/sawutetegetopukolimug.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/62069555241.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jukibunuzilagoxuto.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/84627238636.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210701050333.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/81087373711.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p57nec0o1faqfsjd0i5jpdqkdq/69335198248.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/32599916468.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 11576 bytes
SHA-256: a037386d0848c84534b8473aedd7490e0f28b16a6de56a1f370ffb33d0c5f3c6
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 16980 bytes
SHA-256: f095c10db943f6644f83b9a88c396d6d0bc17028f5af2d10f2073a3f0426d3ca

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