Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fb99550073f90e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-20 23:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd75bc58e895eec71be0fd0a167649d7 SHA-1: df94d68ce92840afd7f89271794a829310bc56ac SHA-256: 72fb99550073f90edbbea4c4c87ccb75bd730a6861b08c73896a65c5134e51e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF employs an image-only lure, a common tactic in phishing campaigns, to obscure clickable links. These links, including `https://drafthe.ru/uplcv?utm_term=best+site+to+download+ppsspp+games+highly+compressed`, point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. No scripts were extracted, but the overall structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=best+site+to+download+ppsspp+games+highly+compressed PDF link annotation
    • http://changrung.com/ckfinder/userfiles/files/belifixigaxat.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/panuval.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/26084433462.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58266056e---lenerunovudusefavira.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210916194614034.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/mawej.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11597dd9c---11226857988.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab011494a2---wabanivosivurujebazova.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143224c4c5c5---39655850022.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/kubozofaxejilobisososibu.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/wukasas.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/nuziw.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/jumejizop.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/52211481579.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/vigasonuxizomazuse.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/zowemogurilefir.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/9995552452.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/245395330.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/novolikuvisazugijami.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210914121914.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42690311831.pdfIn PDF document text
    • http://sieuthibds.net/images/files/fizojujeparuj.pdfIn PDF document text
    • https://ptogel1.com/contents/files/mujabepopewetidezazor.pdfIn PDF document text
    • 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_off0000af4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 13880 bytes
SHA-256: e27cbb744d895ff31184af3439ecdc508f0b11316ec45a563d79a7dfe8b65298
font_02_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 11216 bytes
SHA-256: 9b67d7cbad4e05595ab2cb9f583e5d080a0015443efcfa37af2735f9af63da47

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