Malicious PDF — malware analysis report

Static analysis result for SHA-256 357405853b945dc5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a37f5840cdf08ed5b678f792d325e6bb SHA-1: 903a34993a1a9f0c0d42ec3708b7dc9fd8f62be1 SHA-256: 357405853b945dc532f24b0aef5bfa6e56fd2aa8d7a965b9e0aed29f8d68e955
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and utilize a link farm technique. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afeff635b9c---junugevomezegenegexulubo.pdf In PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92652565989.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3982ca2ea---13393840532.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/67522979713.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084030027f36---45569198011.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160843183baf97---pijozozavadekiwusufanuwi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff36d6338---tavekobu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/diwiduwaguma.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/xipaximenutirajew.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/lusomeviwikodovepaxa.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9be086e968df87f86336518ec89d77f3/2998272962.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cf84f0a200243e751c32dd3022e320c5/xotojun.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/25847552944.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/30028624618.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/doferulumer.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/351e9c0bf7399016a250582cbc7e98fd/nejorox.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/71002563258.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///nuxedur.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc34d4cedb---xegoxe.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/6224562824.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1a8b6c5447b0b6c466d614dc7ff8f3cd/sewidokoxemenajositod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954de9eb037---gitexof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+starts+and+ends+with+e+and+has+1+letter+in+itPDF 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_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 10356 bytes
SHA-256: 9f5e60bf9efd1f2394d6fa08ec182eb0d8bbcda8a5be0e7c2a301e11ebf71111
font_01_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 17528 bytes
SHA-256: 5568c89e7ee5a06899ae757bbcac096114e9f5d9800aa2543e09da41cb855e95
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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