Malicious PDF — malware analysis report

Static analysis result for SHA-256 3711626ff14415ad…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 00:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20160623e58bfc16e22158906f41606c SHA-1: 48ba02346a8ab865c186b210530fecebb24a0083 SHA-256: 3711626ff14415ad47ca210727c6ce423680a8048f4a0058e7130abdc68bd4c3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document contains a 'Clipboard command execution lure' and a 'Callback phishing phone lure', suggesting it aims to trick users into running commands or calling fraudulent numbers. The presence of numerous embedded URLs pointing to potentially compromised or disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=sopep+manual+book PDF link annotation
    • https://markyatirim.com/resimler/files/64569471670.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/josukidedanutalalojazu.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/99994019929.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f78c8318a---18575875365.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b853c42645d---zasiginarag.pdfIn PDF document text
    • http://imaginove.eu/data/Files/65162526790.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/7e66895e2637bd5ed9e87f8416546782/xepowudedosafigixu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0b9lequaoaqjg7vu1vfb95h08r/weputanosiwizumaxomagu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/39377540255.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/58603135342.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/xojegewepalafepegirawati.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1517cc9f9ef2c64ad9451d7e482bb84f/xezuraxaroxo.pdfIn PDF document text
    • https://noddy.nu/images/file/41558932115.pdfIn PDF document text
    • https://anakmeong.com/contents//files/78139779739.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/33ff73e1ce5d82a6139d8b251643817a/3957240591.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091adb26ec00---pifute.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f938287594---gepewesanafovakanuz.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/72338714274.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7dbba6e7---60501550397.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8cab0ff9d---givowoninebalij.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/lemunakakirukax.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/tusiwubotevopemu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2l80qr3g4jc8p98imk3o9vd1oh/27037010510.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/2776296679.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/15451596616.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/wosowovekofija.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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10360 bytes
SHA-256: f1decb76b6460b643edf77d9d2beef5fbf3e8e9cd4289608025d314d28206f88
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 17284 bytes
SHA-256: c8b771b9ebab77c6e223366d02e2822589b08f61a43c9e7268dad6d27f283312

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