Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5f98a75c812a14…

MALICIOUS

PDF

73.8 KB Created: 2021-09-12 14:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 653f0eb5e80418f24a1303e89ca891a7 SHA-1: b3d7f43a824b24c60346189f58c1831ca5caa5ad SHA-256: bc5f98a75c812a143796774da780d2c192754fe4204d202834818ee139f96168
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of 'cmd' in a URL suggests an attempt to trick users into executing commands, possibly related to the 'how to crash hard disk using cmd' query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=how+to+crash+hard+disk+using+cmd PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/rupuwadimemukewi.pdfIn macro / runtime command snippet
    • http://thevale.us/userimages/fabukaziki.pdfIn macro / runtime command snippet
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613297b89b6d5---82545678447.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/kemavesirekedujirowudunip.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/ketit.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/25641732769.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/54974663019.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/63955304880.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/93400374839a0a1ac7732d2c20745047/metidesimok.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161339d1b34458---ruremirotisoxil.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/xemitavudevoxitisimedade.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/81358712568.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b1c672f8---44259941383.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/gizapevatumomolamogofi.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/84169851710.pdfIn PDF document text
    • https://music-group-store.com/upload/files/wevisulutadozanatogem.pdfIn PDF document text
    • http://chinalabware.net/d/files/susoladubofisi.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/kobiselolurajuvosos.pdfIn PDF document text
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/99822608069.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/9446514643.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d8046a1cac1c6ffc3bf7aa255a76a89/94574082369.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/39242810143.pdfIn PDF document text
    • http://short-story.ru/upload/file/8706216428.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_off0000bc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC71 10908 bytes
SHA-256: 8aae06d26385d4426ae749414c579894524978eff10f6360be134cbacfffdfa4
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 17412 bytes
SHA-256: 54fb9b19d47d16fa015147d18c24b3f80367c63f5926f72c0b1d48f484498648
font_02_sfnt_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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