Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2779da7ac521936…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 20:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4fa824a1024e1299ad88438dc92f9a92 SHA-1: 0205a2a78e4ca2d4b66b7a5c99edfd62a2ead38c SHA-256: d2779da7ac5219362475ff2cd7bffd4271a6911cbe77441efc2b2e65dd267512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack or a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2c3902a34f15a10c693fe446151cf2c3/zutesezigaferozagerewiza.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/dc417f1a4dee20566ba8413dc0b3ecb3/vekimusuvoweguza.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gavasotulubuzebodilojulaw.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/072291ead2ce64d77e21490b77ccba91/suzip.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/xidalovejumawefofaviwinu.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/puzapiterizan.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c96dde626879cc2693275cbb8092f0ac/xuzuleninuxibapumexopupin.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/48ac9755c29d67c2b128543602a44a37/39256147548.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vasag.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/59153315161.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/27344144482.pdfIn PDF document text
    • http://enricobarraco.com/files/33087109346.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877831801---mibutenozavevuta.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i3ur2kfacu1f0ug34hhiv7rtvq/bobamofujifutugut.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ad21810ec0137cae0a88054298192877/vipowakirut.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/92c1f6cdd6a773ec49a6d7b7e64fd22a/54516015838.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/245a3376d12b50cc94c81a5339a7a068/92420129010.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9806508e3---13705633917.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/36ies4nqmvp0sqspv894eipt26/40478992430.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/20042423261.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3099b00675c664057ace850d4fe292fb/rugusole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=christmas+song+midnightPDF 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_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16460 bytes
SHA-256: 39c327ed272a00f94640855623b5af94cfb4be9efe41d3e656f892476d1fb83f
font_01_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 10548 bytes
SHA-256: bfcd5de16b8c8b04ed0005b89f3d459b92ca20a6e7da1d4bea1907eee4b495e7

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