Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52f12752690df12…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 16:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48b6262474e04b2ba2d9c04770ca6d29 SHA-1: 6b3ac8e6da6ce50b6a7f321ae0d0bcd9d071e4c3 SHA-256: a52f12752690df125d09073da1fa5f886bfac8e8ee1e79c52b2afccc3f6d322d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs further supports the idea of SEO manipulation or tracking for malicious campaigns. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=what+is+android+contacts PDF link annotation
    • http://kryotherapie.net/neu/userfiles/file/47166643015.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/toloxunaxusosotifoviwovi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134080585795---zugamoleg.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/85276313192.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/36162761035.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/55111792849.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/vimovadasavixinosivefede.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/mitixidogadaxa.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064fea4a90---nowoxafabuguwawije.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/mapamowikixelazo.pdfIn PDF document text
    • http://bienbao.org/uploads/files/91614915731.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613023932b120---5287331817.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/nadadikeniwofilovewa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109100743579979.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/ropasilusulumul.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/550487eebbec389b70b88550cab2a145/23556586765.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/bovixadanugakukukoju.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a02e5cf7---14995924044.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab48b6b809---mofafabopetefareve.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/26879057467.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/83206667217.pdfIn PDF document text
    • https://bnovum.hu/downloads/feribesades.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_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 17876 bytes
SHA-256: 29a7105653564e09c89d7190b2debbec40c47954e21bf0a26dd3fbb828410e79
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10280 bytes
SHA-256: 4ba6cf162fd7c00940eadb44cf031c595b888b36112334a2237b02f3dfa37ed7
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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