Malicious PDF — malware analysis report

Static analysis result for SHA-256 870d6dea1d38901b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 22:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3fc49343ddc8a1c81aad0de4a7e60c0 SHA-1: 15d255fa1836b3c7f3468bed1222421d8c5f64be SHA-256: 870d6dea1d38901becc29a707156157eeae7ee34f1906be71b9b3a5c4e531460
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to potentially compromised websites, suggesting it's part of a link farm designed to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a technique to evade initial security checks. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tobn56.com/UpFiles/file/xamumodiworu.pdf In PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///gitedukanaroxodot.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/dogebubu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wowawozaduzoxojerosora.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/wuxatosukuliselinulodax.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/zidasukewigeretuveso.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/84563096116.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/49679227044.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a207f4a470---4333711967.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/35411733219.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109021513594384.pdfIn PDF document text
    • https://andhimazhai.com/images/files/zefod.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133683cbb018---27311159854.pdfIn PDF document text
    • http://etkenkalip.com/files/penuzukoxajewubeparo.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/vomurarepomasavenimubob.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/79452597165.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff61940bbb---sonesimumodipujila.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/35507695.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/leroxivej.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e3749a03---21870691390.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/nejifeva.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/jajutozevizapeta.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/jovijukoxeritute.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/lotexe.pdfIn PDF document text
    • http://packamate.com/userfiles/nejipusokajusiro.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/88949668729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=es+explorer+firestickPDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 17156 bytes
SHA-256: 3bf44e61ec88cfd098d3a358778735c5767d6466bfb149f4b3becd5c63d4e626
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 10384 bytes
SHA-256: dd50ac7c3d6ff519b669ca841c56367c855683af868375bb9130abaa87ddf52b

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