Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5682c1a14fefb2…

MALICIOUS

PDF

101.7 KB Created: 2021-09-07 14:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3791336299a971a9d7ac7f42a3364609 SHA-1: 5b649fd0a6aee57733ccf8446720de9f708d4716 SHA-256: 7c5682c1a14fefb23e1e0c6d28a6ae855ba84eddff5847c683352eda3967babd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=escala+de+bienestar+psicologico+pdf PDF link annotation
    • http://madang.eu/f_pds/fck/file/59209422396.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/bidomudetaxomemejineb.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/nugawabumilugul.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/47344544633.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731dbc1b03a---bonagav.pdfIn PDF document text
    • https://shrisaiexport.com/lightspeedweb1/file/vunivukenuwilopufarebom.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d26a1191e---4196766508.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/64458051098.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/42897699985.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/boresoxosegutesifol.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd79b0f9e9---39879271323.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80721ded7---veroxipepesazijumopebowu.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/56298828269.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/4693293007.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/dd881240d9399e5ec6c8b1d15005f06b/35800035497.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c02d8480---72506528324.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1216fb00a1---jutodomuposewesakedi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/icb7rc9qp9up1njlb2meticiip/xetamurekemipatubibexego.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/53869993766.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998350b1017---6328542065.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_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 20680 bytes
SHA-256: 4dc11984cda47a33b19cf314edd4b491a092c6e6b7d2fc6c551d33fbc373e0c5
font_01_sfnt_off000157d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FEC 10920 bytes
SHA-256: 446860b5047d528c6b02eda1e12db1effae90000e55500fcfcd80142657c73f2

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