Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c878ca2bb409f…

MALICIOUS

PDF

88.2 KB Created: 2021-08-14 11:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11c2769508c3ee99c4c9109057d8c83a SHA-1: 42a10d8a3c4ddbc296e2cdee203b9f23cd163504 SHA-256: 6a8c878ca2bb409f2e6e179288a5a1a32b79096fc558d71a2187bca2a9973510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting domains. The primary purpose appears to be directing users to malicious content or phishing sites, leveraging a technique often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/bebajitadijogizedame.pdf In PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4cd43e24d520aac1b25db9355429e25e/zebizex.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/cd87b14b90ea2e96ccb4d77e0b48e8f1/48641438291.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b06fa18cf---93561631408.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/fopiwuxokolizirefu.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/63431981315.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/72641459726.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a049903af18f318368c96525dfb3eb10/benajebokukewusorawizu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160de4d7f24e2d---dujipunalegebemimemu.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/94618096577.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/lagolasawumidezu.pdfIn PDF document text
    • http://falerisztika.hu/tmp/pebofolazalitijuge.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/edc0375aee3776774db21f1bf508499f/31062719540.pdfIn PDF document text
    • https://telorgabus.com/contents//files/lipizuduvodagun.pdfIn PDF document text
    • https://migger.dk/userimages/file/sobaziwa.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/laligutufikirokokedixezuk.pdfIn PDF document text
    • https://partnermind.cz/images/files/detodudomoduvapeloluze.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/bab9a94ebdd4156d79611528c3191e98/vewonuxuxuvodemuvasowi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tts419fq6smu3nubp40e81huo6/xonelunizuvetob.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b344dc99764---bifininewiforapomevewu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/nojnalm8m0pvpq9jua8h20289q/17747163849.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef5739490---480593598.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021881730561273.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/63590147379.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/sakab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nice+guidelines+urinary+tract+infection+elderlyPDF 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_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 16428 bytes
SHA-256: 4b8e712dba49380015c7a700adfec760f30c66b75c8869e982a7c83e5b46643c
font_01_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AC 10844 bytes
SHA-256: 67b912775daa9643c16d0e1dc878e0768eab0f081460a6f2556c7a26dea3fe6c

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