Malicious PDF — malware analysis report

Static analysis result for SHA-256 db821588b73d9fb9…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 12:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e02373058b3c79a70f1e4659e156f1e3 SHA-1: 0dbe30b5de92bf4ac79fc8fd9f86d6af0950566d SHA-256: db821588b73d9fb92385da5ef067067a93be8b050bff9f67cef3655127c80552
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a screenshot disguised as a document, with embedded links pointing to potentially malicious URLs. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a full-page screenshot hides a clickable button to launch or submit to an attacker-controlled URL. The presence of multiple external URIs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 69 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://catamma.ru/uplcv?utm_term=download+game+the+sims+ppsspp PDF link annotation
    • https://austarpharma.com/upload/files/batupademitojuwaluxekege.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/47160953506.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/xivogaladagujes.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/98298812747.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/bee63ba0ec5c0fe51814b3fc69389659/77632187701.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/gumepememamerezadoxatej.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/57114337386.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/vikoxivadijukupesefewo.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mokajatowikepu.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/damowezatumaxeselevosawuj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e688112319b327853408c11aa0921631/44570061482.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/44681005773.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/vedirufisekotamexa.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/jufotunusi.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/pewivateteb.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/lunipivanoput.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/94503352417.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/snimrp5e6n335fomptpinscnpo/68405446930.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/xojaximupakesal.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/patawodaguxazelajivu.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/fufabadamana.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/purojovipusatixoboselok.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/mabunegeguvat.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/aeb70d3b822532d6e29ea7e2f3c0b906/dapimoxuwibova.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_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 14240 bytes
SHA-256: 75288a705d62919e7fa2de9fcebdfe4bc91a1bc46daabf86051a23b971bd2483
font_01_sfnt_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 10824 bytes
SHA-256: e4af6b463475aface28c391dc88f2a71a3de1c6eb4b2c33bdedfaf48625e80a4
font_02_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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