Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef7f19750a0932d…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 09:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 777a8b73f822dc3bcdcc2b467dcc5065 SHA-1: 94194353b9f66bf6e699f41e499a70fe6b1be871 SHA-256: aef7f19750a0932dc8d32ae25a2719eb1c3fa7c318a5e690f251d734fe1cbe6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=married+single+tax+rate PDF link annotation
    • http://maulich.vn/attachment/files/zixoz.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8968e253952f1df5d5c8c1fe2698557f/6433338310.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nifuxesaremekad.pdfIn PDF document text
    • https://oasis-travel.ro/files/wojezaluxititefu.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/rugepemivirimajigamikusan.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zoxefodunusumetoj.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/8353932531.pdfIn PDF document text
    • http://boki.hu/editor_up/93821718278.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/12442205294.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/67907731761.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f69a622099---vodenugomuwin.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/17201015681.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a679d3b40442cf813cd902e227135d82/nolijek.pdfIn PDF document text
    • https://kulittelor.com/contents/files/zalopelevujuvutugixezoti.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/lepunomuseguxusaxediwul.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zuton.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904030502.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/82310949561.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/kagozitubigilagowerenaka.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442cd5bf256---59017244638.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/puwubixivijurileg.pdfIn PDF document text
    • https://noddy.nu/images/file/defub.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/62067740802.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a5f0755a7203f95991c2bde54cd06576/60996213957.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/85818063773.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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 15356 bytes
SHA-256: d497edc26729de28952ff8e2bd8e02e006e7292c12a152fc3e7c8fce11f2c09e
font_01_sfnt_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 10400 bytes
SHA-256: 8b12cec9250c801c346a80b3f8149701117a770a079687b202e0c8549df74838
font_02_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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