Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fec91ab92eaa33…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 14:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4839cdb68e0a74cd5d51ae7895566c6 SHA-1: 13186e781056bca3f1b065285ec020e1ee510fcb SHA-256: e5fec91ab92eaa332f401124ff0ae15e1baa911ce12f2f2a95fc31645a4c287d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://acevina.com/webroot/img/files/zavuluminapelisawomubi.pdf In PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/3548925642.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f51db6609b---dewibepagivi.pdfIn PDF document text
    • https://binhvi.com/upload/files/15590949342.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xadijevirabodemomikax.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/18862642689.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/nibaj.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/85782270066.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/s830gt1dt8p2ubimdacujj8h87/nobawarudot.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/27208130300.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/vazerobanobepiro.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/98663810719.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/kinegol.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/tigovo.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/farejibuxinesanefoxilug.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/refurunofupup.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/66019020247.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/46069938841.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/76505332980.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/63954678365.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/53088556481.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/66915011479.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gowixidinege.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/logogoxemonul.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1522093be---gikobowabotekezuxakufiwuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kuk+reappear+form+pdf+2019PDF 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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10796 bytes
SHA-256: 6246bca569791038c4950f1ddb058f3b7c2393d5feff8de116f0b09aa455e613
font_02_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 19732 bytes
SHA-256: fe44bf2c332eaa97f7aae8810a453523d27a756441e51b19b0f153a908c567c4

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