Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcdc1bf18b364b3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 06:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fc707a28324486942937aa867fa6d51 SHA-1: d8bea281d8fae4349b192969482447ad92f6af39 SHA-256: 3dcdc1bf18b364b3ff8e42f197cec00b193779734f5b7b78ee59ff8cc7204d15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on disposable domains, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baobianhkhang.com/upload/files/83421061311.pdf In PDF document text
    • http://meetburgerusa.com/uploads/files/tufugilaxopipijenufisap.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96bbb0f4798358170d08b7ab60499493/25820143017.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/sujijazojajokodod.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2jlot11584gr7g6s0um2u6gplp/3609462618.pdfIn PDF document text
    • https://areicon.com/images/file/wefizofagelawalitaki.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/baf4e770e936cb1d46771219e93d126c/zugiriwaruzolevamawer.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/demadimojetiduzosesekubaz.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/74978307815.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/68593847178.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dodozotadirukojup.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/89575463074.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/fiviv.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/72763276728.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/78589100629.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/04d11dc8ceb156dbf2d33bd1afef55d2/94183362201.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/xelop.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/75514271331.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5b82686---toruvoxabudataxoda.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/jovodag.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/nirumotubifefawelu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/96899229839.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/metiwigukojobed.pdfIn PDF document text
    • http://apsons.eu/files/file/77909499462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=call+of+duty+4+psp+isoPDF 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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 17372 bytes
SHA-256: 295aff020a85032a7ef06d8c8b699b99b6283803a821e6f874e9cd34600da96e
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10476 bytes
SHA-256: 4532c3b51cdd55050c0f997f811565899df96918694e5d8bf91737361cbad5cc
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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