Malicious PDF — malware analysis report

Static analysis result for SHA-256 107b2e391b0ae27a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 20:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d41528adf4ee167d27afdab32e53cf7 SHA-1: d7efca425969f843e3050a975204aac45e3829d7 SHA-256: 107b2e391b0ae27a74ec82a60eefd6819b8063ca5a60d510b5e6b98e2d6d304d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also suggests the presence of commands within the document text, potentially for executing payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://synerhu.ru/uplcv?utm_term=discerning+the+voice+of+god+revised+pdf PDF link annotation
    • https://aslimitada.com/userfiles/file/36082899287.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/3624980680.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/49e82418a125858b087df9eb9d481774/14046434983.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8caaf2b83c---zumawutuvutu.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/sopexugogavamarifiruraviv.pdfIn PDF document text
    • http://ud2-140.com/files/93242483768.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd03550878---2583145585.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/927375617.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/rodizobajafejobum.pdfIn PDF document text
    • http://valeneighbors.com/userimages/86944991532.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/91561474996.pdfIn PDF document text
    • http://newmob.it/userfiles/files/bubunifopov.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/fibizivasiriwuvaliwi.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/igu03pch2gkggcurlcmnpglu0l/90612823814.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf503be5b---73487614771.pdfIn PDF document text
    • https://zold-kommando.hu/files/88047646049.pdfIn macro / runtime command snippet
    • http://prabashproperties.com/ckfinder/userfiles/files/86153487529.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/gikatu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/d794b1s0tbf17bs1nv2hrnfqi2/vaxozeratozilapi.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/nomujopamejixite.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0nhjvu6k6jd6teg1iidimc2lc4/zezotilewomasamat.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/gezitago.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/73386815583.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/lifuzodim.pdfIn PDF document text
    • https://www.karenlovelee.com/wIn macro / runtime command snippet
    • 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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 10756 bytes
SHA-256: c09ca4eeddd6f4a3e3ec0aa80cb9a8bc0bcc932d745a243a497cd1fb83f85de7
font_02_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 17264 bytes
SHA-256: 7d882c2b9b74d65414378ec5c84171108d300d62a2f30f3f4f01b14e5003b846

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