Malicious PDF — malware analysis report

Static analysis result for SHA-256 706bb11ecdfc210a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 15:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f59667c861200e838b4c62579dd2da7e SHA-1: e259b688b7c887aa10af5a8566164aaf9918ccfc SHA-256: 706bb11ecdfc210ad0384d2c17e746664312bf61f10f864d152c38312e10c007
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. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://catamma.ru/uplcv?utm_term=sega+mega+drive+android+emulator PDF link annotation
    • http://tingchucontrol.com/Uploadfiles/files/gowawumima.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/81899754642.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b06b5f7dd0cf8a6e63a806ae00fff45c/ludidora.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/fojajuravojinujuxepefa.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/88583472342.pdfIn PDF document text
    • http://zatacorp.com/upload/files/18620058431.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/lotofu.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/togomizedujisuzaradu.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/51384780087.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/falewo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497f64c1f78---49476394537.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sofemi.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/kenufirunumik.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16152f97a167a6---82559164831.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/80492012492.pdfIn PDF document text
    • http://mega.kz/media/upload/files/16112434401.pdfIn PDF document text
    • http://manu-transport.com/documents/file/35322776995.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/retesizoxamomexatupida.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/kotonesogepepusa.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/napewigosizezogozizi.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/94662961434.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/gelaxebari.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/farotazupixudet.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/41050585314.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/28363696966.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_off0000b3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DC 14812 bytes
SHA-256: 4f707f6e52745dd520a228a0798a006d802147f9e6de2de62be8e4ec796388da
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10664 bytes
SHA-256: 2309df020bf74600a80f72aef5778b0f396b9d781cfde0d17dfa82bb58e766a4
font_02_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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