Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af14c7a8be27136…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 00:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae24b3fd93d6f7a23b22fc7b3414427f SHA-1: 276fe3d6234a8879403924f16cba48a7f2740f3b SHA-256: 8af14c7a8be27136ab0c3dd36e34cc8f25e9069822491b2cefbfc4e0bba326ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many links pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/865f541ba40921572aa2dfcc17b17184/70778988804.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2544acae77---xaxabupepufupixoguk.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/marijulekaxabafudak.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/31660666665.pdfIn PDF document text
    • https://bdata.vn/upload/files/82017382918.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f16ecce70---sologa.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/72266206274.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/86997850672.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/41989e01ea2221e74076010a340e14b0/bipolatakemigo.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/zamijuvinalazuvedaje.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/45170751242.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/39606732754.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/dajulemajexoraw.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/najeragififudar.pdfIn PDF document text
    • http://dfanchem.com/upload/files/xipuloxoxefo.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/54811090619.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/tilovezojuwexibesobopi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ekqopgshb5heu2pcki1v9eji11/98843402047.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tepufutegipevenu.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/080rsnnhtdccaeu6e3rpqtvp64/96085989577.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9d18af90---22988701764.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/33034683743.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/85340582764.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a2cd0b80---73592523227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=reading+comprehension+strategies+worksheets+3rd+gradePDF 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_off0000bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 15604 bytes
SHA-256: 832f9bc226c872c6e677dfbce67bfcf15b1fd22168bf833cd77217fd562a737e
font_02_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 11312 bytes
SHA-256: 1c722de1e5bed89b092dc830ce1471e75cc50453862085dad22d10f66bb6c1e8

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