Malicious PDF — malware analysis report

Static analysis result for SHA-256 f852d90a944c114f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 19:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aba40e7dccb386d9c60fdb1be9c902ae SHA-1: a0751a59e42c051da93fd19f817c1d87f69ea12e SHA-256: f852d90a944c114f4074953d2cd193cdd03c56f17fa8c61177acbc9a578f6cd2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document contains a large number of links pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. These links are likely intended to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://pistant.ru/uplcv?utm_term=abituriyent+4+2017+pdf PDF link annotation
    • https://ezastupitelstvo.sk/editor_uploads/system/files/vabixa.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/aa25660e3633423be40942dbe4354be3/zuviridivusaxez.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/mijojaxamopusunifud.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/sisawudikev.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b0012971---56732913382.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/41369974124.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8071ce208b---bukokanonafer.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a15686e62---kupejitedejom.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/vafixove.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/josatedunemilibuge.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1abaf88ad346e77a5e917fc287622141/51710073765.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/21078833204.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/91bf34a1a94fd13085724ef64856f55b/93845138390.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc166d5577---8704619646.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/52239368715.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f9488738---22425459722.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/45765730360.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/da893uoi6qskgsbu6han1nvojr/980490498.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f705ae7466e---84125904669.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baaf493a19b---zirozidulegeguzagu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/75016280739.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/93904678595.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/73395904604.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/87414293457.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD29 21568 bytes
SHA-256: e4e01b872ab2763ea3f9d030310d93bb8f7de7b21c4289ad17b8133d9b892cad
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 16528 bytes
SHA-256: 6fcea206e225d3bf7d7e405322118a9f0ac2c144a8b282a730d73b8032500443
font_02_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 10752 bytes
SHA-256: 8f923c047a04820de40d3000c643208f42c2b3879a376f1b819ad5edc372bddd
font_04_sfnt_off00013b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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