Malicious PDF — malware analysis report

Static analysis result for SHA-256 94511d394bde5a11…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 04:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 944636f908d0c80ea79ca4947f8fd481 SHA-1: 12dd8c7b21445cca4fc2651b7d39d2fe4acfab31 SHA-256: 94511d394bde5a1192830d175bc526fd473ef15fe4b0179d4858cb33146084f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristics identify it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to PDF files. While no scripts were extracted, the presence of these links suggests the document's purpose is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/iud88ov48spe3t23k424m5vtsq/xenejinokevuj.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/xigazimogi.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ea266f286d3890428b3dddd949e06f02/roganado.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f79a24eb5c5a8306130e1dd8bd8bda88/lonixajomiwixipimedin.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/nufemisutisasononigodok.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/darub.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a353225f0---11272508917.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kopero.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/46609288452.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/fuwemumezijotexadu.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/87272789088.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/30406087005.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/79352276915.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/8745768300.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/78636544603.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/ragilejeguxozejekesojub.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/xuxijekutipefazakiwepad.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300b523e1c2---wekikesuwolefuboz.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/guwuvazibudomitakisok.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/652c491f9edd0755aac439d5f99f5729/togimididodajuziwesur.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zudiwoxege.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/ranim.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d2307cb85f3b6a1484ecb4487c590334/gagawedegeleleg.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210713_516B7C5CEB8D9D64.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=identify+the+complete+adverb+clausePDF 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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 11256 bytes
SHA-256: 7fb99f7d9daa407e96cea1d825463731823d595d54d58903a8f6a9d0f1029a68
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 19060 bytes
SHA-256: afe03d3bafaf625ce30942e8465dfe50d2e163f426915b5072fb3528c7a93df8
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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