Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3872abc1deb245…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 03:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cfd23de5c27ecc7e293d9044a40cd951 SHA-1: bf7979817ea12f1367e27f12330f038546af0c6e SHA-256: 5f3872abc1deb245a0e1d5e2219cd645b746f2178f9c9d8c4ffd65cd2d057576
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of external URIs and the overall structure suggest an attempt to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=how+to+add+magnet+to+utorrent PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cfdaa8d60---29389018223.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gawogizedokol.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160992b627299d---99740075069.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/nedis.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/oimvc2ltftv09e6cmrci4s3l3a/47023149795.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/60066596952.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f2e4eddfe---babokijaxebenibajeda.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/subedovumikibag.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/59120913904.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd93d6ce3---jugosigafawitur.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/mtdto614l9cmdbcaq8e142s9du/zofulewomidapubizajasobe.pdfIn PDF document text
    • http://jp-cable.com/d/files/32602662522.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae08a584e---34050150110.pdfIn macro / runtime command snippet
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/78ee7eec8193d7c2b4df726fa853d07e/93560673014.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af452b81---bajabajukumujunif.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6db5375f---nuwepabate.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/kipanupimu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816f560415f---wanusobisexusokusaro.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/13dcc4166a3d7955f7dbfff157c31b4f/18679390016.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2f349a424---gepibub.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_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 17540 bytes
SHA-256: 6136ff71ed614540b080abf511e4f889f19b65392ce8f4ae4ad9632f0891b376
font_01_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 10464 bytes
SHA-256: fadc379041c5a0025ba6a6fe0de65187f1e8bfa331953d38a5cdfce4caa6825a
font_02_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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