Malicious PDF — malware analysis report

Static analysis result for SHA-256 42417333331ee254…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 03:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 726cda95ddd14068643a6b04761def36 SHA-1: 95cf52fba547a930196bc45d5e114ca3080684a9 SHA-256: 42417333331ee2546fc2c55d4474d95e44219d0dcff543f77431a1c4648e1851
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://senesi-sklad.cz/userfiles/file/nobabanivosenijidexufiwu.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/guogh9htoff28f5ehq8u7hdoh4/sinironaletorutipum.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/71723f1a42662631a92c5664c6469cee/xudufaxamobexe.pdfIn PDF document text
    • http://www.centralperdana.com/file/88913727967.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zedovotufidegasetanim.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/japexibunazimagufunalare.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d93ea5ba355e48af2a1ca2343bcd8940/85358378225.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/53498744380.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c447a441c79a5fb795c3eef5c1a5feed/20684971860.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/4394978170.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ffe34cb9---bozotavupo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d735af1dfabe5ef86ffff3db066c3cf6/38929457244.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/25350033715.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/mowir.pdfIn PDF document text
    • http://corkpotters.com/images/87058453178.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fononaxogiparibedarap.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f32b494215---jarotivexifit.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607516c3bcd0d---raxofovejevivo.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/jodupinoruragowoba.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c40302b4---xofugugisuniwadedavadoba.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/69903493841.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/h1kml3cvbs9omgnr0r8lv7l457/piranunovebite.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/72587047949.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/497c912d28be757025375b6fa96d0f94/midesan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1684c8596f---vekevejewujewe.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/taraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=marvel+questions+and+answersPDF 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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 10632 bytes
SHA-256: f95c35723dd363e893605a9d2a217c4cce48a9704a8a21adcd5d2dbb9140ed28
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 22180 bytes
SHA-256: d6b0ecc038e0c7b14aaf124b58a16d45757f778c19d1b6ae0e75a97a23d454e5
font_02_sfnt_off00012aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1