Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ef97746e05ef46…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 00:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 054ba5d97659de77e852e1aa5110af43 SHA-1: 72121b8f285d9fef82161925737aae42908408e4 SHA-256: 91ef97746e05ef463e62acf9fa59ad958631f3580d6fe2ae2519f1ea60d1b055
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/mapatikofubonozop.pdf In PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/19f923fa2c345dee0431bb5444cce904/vemegelos.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6666e47393c4deb341066c70356f3186/gonetodomosunowulu.pdfIn PDF document text
    • http://terminal.hr/userfiles/file/bilipaxanabasezil.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/65323324991ea8bb8d8981182849e551/dazepevimeneroxavinomak.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4939344a213ff3a2dcd5a260178e6272/verusuxebiripume.pdfIn PDF document text
    • http://farmina.ru/uploads/files/79960293086.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd98d2c95---3757421339.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/14724085112.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rnvg8dj0onob656ncdckucu61t/19562528318.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/047f58d0eaca95946ee4b921e67322d3/37342942792.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/280130d59e3055b2bf57db289223338e/sonevupigi.pdfIn PDF document text
    • https://xistenze.com/files/files/9800003298.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fa50f515a84a0335edebf0f6e3f30d73/mujexezavu.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///84945490416.pdfIn PDF document text
    • https://people11people.gr/uploads/File/19243207656.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7984f6e6c2---52204215654.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3a013575---fuzizoxobafujuxuweveribug.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c1597e63011670b72e853206ae641834/xasevenelubemadogomedotim.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/43537321954.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pavomere.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/24151834032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=who+first+invented+writingPDF link annotation
    • 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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 10572 bytes
SHA-256: 1e9b791fc72d410766b605ff671d526bf1b7ba3cb6d4ede302dac0a1acee740c
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 17756 bytes
SHA-256: 721d247bb091db78bb8992e81cc4718886f1ffbe86a465249e12dea3cd64f230
font_02_sfnt_off000129b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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