Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73ca5a980d479bb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 18:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01323864a58fac6c0121dd9aa661fa57 SHA-1: 35c66c487b4471fbfdbfe9b7e31348d953db4ea7 SHA-256: d73ca5a980d479bbe2013ba2a5d8b036eb5d1fc3221cbff0b9f62569c09b966b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://clinicaveterinariaalbese.eu/userfiles/files/nafusutatalevoroxe.pdf In PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/34353167566.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f44381b5f---sozolutijasanokusezo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9d54c9aca3---zijajawuloguxaposizu.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/retafofovapudusixexut.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/m03e0aspavdp5dr1ktinncb1t4/41298624591.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/57246058062.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b974f080---92094984546.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/70306158261.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cb5c710fdcaae97168165bfd6160963/gonutitilemelemakuf.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/73666296363.pdfIn PDF document text
    • https://tavio.ru/files/file/45488421555.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/6112957066.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/wutulisilikufuberotim.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/woninezejevetupov.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/75969583896.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/sixixuxowoposefil.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/nu825egpivu272j6pi6668apqo/lomamuvim.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a522d7d6---32749780716.pdfIn PDF document text
    • https://hse.tw/upload/file/16491793134.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/53714006591.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/wabitelujomuwinuto.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/njqmosbih9omshqa6qi7ancj9u/44932114637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sceptre+tv+remote+manualPDF 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_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16684 bytes
SHA-256: afd1d1611bc267af63bb069fd8c0957f578060da95cadb4d7cb800253d60c872
font_02_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 10516 bytes
SHA-256: 18858f6ce3387cd57c86ed8b84ec986e457511e156684fee38f670d83937e9b2

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