Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27a546377a94223…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 14:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3700a69a0b82c48fcbf31452273545fa SHA-1: c5eb821e01c56b6551b765d97d90e833831e0368 SHA-256: f27a546377a94223435cd39d2040a13e08ac9399f36c7e917e80e1155c3f668e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement, common in phishing campaigns. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=shadow+fight+hack+link PDF link annotation
    • http://style4.allwebeasy.com/userfiles/files/87999235229.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/84380062809.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/97838374551.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/35562597015.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/87562426413.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c04760d2402fda736bc155029253dec8/73874703021.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4954a1ae7---78405194578.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631321903miletizoluzup.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c2f634588---gunedavomaminosunofam.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/348ed3d149f88d8c130b7096fc4619b0/77384286854.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/88592628195.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/movopijuzekevodalabumis.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/towoxuwigoxejunexe.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/zababepumimel.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141799019a18---47245040641.pdfIn PDF document text
    • https://epiphanych.com/images/file/bezexapanux.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333cb59f3b4---61243473512.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/vetifezopazegelegexu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161334131b3cc0---sukebukozefiweginazo.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/puzawaf.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_off0000b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB449 10608 bytes
SHA-256: b247ffa89fa2b59619e74c203b090c089d1fc1193b0f3b0f18f5b0e932b8fd67
font_01_sfnt_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 16560 bytes
SHA-256: 4cebb8dc59a4ca4fadd8f5a24c6ab769ebe03dbdd3092204fd82809c56bd4dfc
font_02_sfnt_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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