Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9a27e19a1a7330…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 18:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94c9ab8fd6b7a516c31ba4b8a06439a0 SHA-1: eb982e4931cae987b67234590633ce1c1f418958 SHA-256: 3a9a27e19a1a7330524adfa3533cf8d388ae9051415167e14708a894e6da4f61
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=gta+5+painkiller PDF link annotation
    • https://acconpriti.com/ckfinder/userfiles/files/kidipufitujumadefaz.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/finomelo.pdfIn PDF document text
    • http://jn-zhsc.com/upload/topuwaxufojebopekobu.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/4371340478.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/lagigiwitipita.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/6384723556.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3mblnapuilmdba2dqsod0johru/596587209.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/78829212917.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/serawasuzubajuvekufa.pdfIn PDF document text
    • http://newworldss.com/uploads/file/94639413641.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vikosojupaxovoxug.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161436fe08136b---gedepimatuxukibu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c5f72052---ropatawanuxebe.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/jopozogeg.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/jonusodijo.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109221908167488.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/95461560699.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/tobugibofobitimijot.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-08/61f3782d6ccd3544204d2f863f8d41c5.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/58000741159.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecaabe5ab8---27762709612.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210921_3D8E2D7263A6D6F3.pdfIn PDF document text
    • https://fuoriscena.eu/file/66774787325.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/diziwofukane.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_off0000b111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB111 14952 bytes
SHA-256: 6904e79fb0f8aeacdaac15c6b75f802cfa6b11d82bfc08ac5fdc66f9b76168a4
font_01_sfnt_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 10220 bytes
SHA-256: 32caf78f2877c786047783e4c97df1606acf7f468098803ff0b04229cafe3541
font_02_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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