Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af396a54c5bcc07…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 13:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d0ff28cf6410aa23f45411070829c9b SHA-1: 9562fbf6094d865f415db35093150a21143b8ba0 SHA-256: 6af396a54c5bcc07f523f1ea72b47983b8e9f4d557dbda4caff02e1b46d53581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The document body is unreadable, but the heuristics and URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=how+to+erase+system+memory+android PDF link annotation
    • http://logisticsnetworks.net/ckfinder/userfiles/files/68007000577.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k6b25ck596oisdpje34mvrddv4/fixabemorekame.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109042236016246.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/pukisuz.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/potikel.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/39408662975.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/57031896226.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/puzuvolixisabujan.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/datewokimijuvusidekiwo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614595775be48---17178282035.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/83755385292.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/saxagok.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132da8be35fe---11620845619.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/ximowujidaxurivudabamez.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/wifuzavobibegagameje.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/83802447055.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fb7e0878920c247147f829d17e609a37/37632256878.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/19609675090.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/nufeguvonapegon.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/mubok.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/30634702120.pdfIn PDF document text
    • https://bataretak.com/img/files/file/parifolerevosomi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/11011108117.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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 16456 bytes
SHA-256: 17fd08c0999eb981678e6a438fd22607a9e8ace4e405a3e434a2cfadcc958baa
font_02_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10552 bytes
SHA-256: c86c24e74e31072215d33b79f65aaf9e7722260ac8c18baa693a065ccb20af91