Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76c62faac481a2a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 12:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29df74ea66d3a7cc38c50cc7a5d7cac9 SHA-1: 8e3bfb7a3685bc3c8e749c7fda19aa8234ce020f SHA-256: a76c62faac481a2a94c89d0fd3cd7caa552bf29eb208e0f044f8d1bcbab622dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=be+more+chill+music PDF link annotation
    • http://innotec-industrie.be/userfiles/file/60322899313.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ba18d81196d---95172227990.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0980b7a7---damimovagitizuvoluba.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/vuxuzimibegibenetowuxot.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/43019533572.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bac78d96---rowegesikatikuze.pdfIn PDF document text
    • http://rc-modeller.se/images/file///vudukaremiboboxud.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gokojuwifuxipo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e002efa12---nomalirikozezemipudi.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/forumuwiresik.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/56829040412.pdfIn PDF document text
    • http://cosyromania.com/media/file/bilizewulolop.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/00bba8f186e73d614008b58d03ec2a6d/54811759918.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/18055189549.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca941261a5---19358875901.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/98ccb5424cba407b4f8a3664c78a6f7e/bomunelugenoro.pdfIn PDF document text
    • http://ipceurope.com/assets/file/75135695022.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9658dd0405---7974943091.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/91951464936.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c0028ec4736fbccbc95a60f5e68762b7/dopaj.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b7a08257388efa0df22ae58189795355/pufederirumuzukozijemet.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/190kb73ovmcs8d3ku0ulm7e7en/25409432448.pdfIn PDF document text
    • https://bataretak.com/img/files/file/44867500306.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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 18272 bytes
SHA-256: 76bddafe8fbd80ac90e5d70458464b76d45361bc8ab837ef5637a1879699ac59
font_01_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 10284 bytes
SHA-256: be8afa6810eed9070fcdb4f75552d4dcae9d818151c09be3709c58e50a1e9bab

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