Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7b2f9a70eed26c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 17:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f052980460ccfdc6d20d3f3bce3f192e SHA-1: 4c0edb77d5d9c7f7ca0ead47e3b223f264dbc254 SHA-256: af7b2f9a70eed26cd82a48e648e33479a6f265c474a249dae31db0ab03492599
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/4325133906.pdf In PDF document text
    • http://4bx.pl/public/file/12202732205.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0a6c6cf774bb93536083cba8089ac05e/1455199275.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595b9c1467---73248039816.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401e289fae4---28382019387.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/85050900201.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/ramebebolir.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc9b262c9---31201624225.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109111901475620.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/95455348759.pdfIn PDF document text
    • http://propertiproperty.com/Uploads/userfiles/files/36786403703.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/44896312638.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/pomotewomurigatijipuwe.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/16152279345.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/zolebun.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100422476422.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090407141888.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/65869270562.pdfIn PDF document text
    • http://villkasz.hu/editor_up/xovimatubesim.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/lajemasafawifopafumujixod.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/87059613335.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/78129225274.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/87ff890b1f9982d71ce6e29ec3644dbe/80898228195.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/66725452842.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/verasasifawoxirevevekefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mirror+share+androidPDF 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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 10196 bytes
SHA-256: 65cface7fc1365a1579a3fd9564cae898aa6f6c9b3773b3ba04496eefb998ac5
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 17928 bytes
SHA-256: 52c22059006581008840b75e1f12dd5c0c6c9b271076472c63398dd48ce1074f

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