Malicious PDF — malware analysis report

Static analysis result for SHA-256 3917dbae371ce7da…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 21:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dc286c3e5953fa45d4efe1e35a8918e SHA-1: 4c4cc119550d0055942cb37115df079239116afd SHA-256: 3917dbae371ce7dad1a7c0cfe7ea2bbf30a0882b52d941feddce665e23cb27fe
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common phishing tactic by presenting itself as an image-based lure, encouraging users to click through to an external URL. The presence of embedded JavaScript and numerous links to potentially compromised websites suggests an intent to redirect users to malicious content or initiate further downloads. The ML classifier and ClamAV detection strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=amino+acids+to+dna PDF link annotation
    • https://houstoncoinshow.org/FCKeditor/file/49996304402.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/5975896129.pdfIn PDF document text
    • http://scpt.it/userfiles/files/14483932223.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/worowotapujikabetasusig.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/1981417482.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/84081522343.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/xebevamaniximaduperu.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/woxujuf.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/potefomilakeses.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jexum.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/tuzidamonolufasobom.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/98839552379.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/61438943356.pdfIn PDF document text
    • http://rubensova16.cz/files/file/53743508344.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/94208664448.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9624d038ee02f2759af6eb9918d5b6d/25287506875.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/22232266548.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/megamokeximojidinedul.pdfIn PDF document text
    • https://ysh.my/userfiles/file/94651187891.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141eefdc2401---26401412182.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091011100634.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pq1deskpict3t0km9qusiu2fa2/fisopisejetijaperibiber.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/93991383953.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 10236 bytes
SHA-256: 73c6df78976170789acdb9729a20c721e21662e1dd2dca511dda775fa23d3866
font_02_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 14048 bytes
SHA-256: 76f76b4162600989eb4d65bc91527df56e411cbc84a0394f7a028be601edea52

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