Malicious PDF — malware analysis report

Static analysis result for SHA-256 177557d97ecac375…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 07:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e937cff7adc5c86c0663126c5446af06 SHA-1: 44a1628693166ee009261bed395165e698ea48bb SHA-256: 177557d97ecac37505af2e8ee1e350bf529c1cc62c9c74ccf39a20e8019f8584
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic to bypass security controls and execute malicious commands. The ML classifier strongly flags this PDF as malicious, and ClamAV confirms it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://pistant.ru/uplcv?utm_term=autocad+2018+mac+keygen PDF link annotation
    • https://detectagsafety.com/ckfinder/userfiles/files/62962318194.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/felivozatodikivesifusiwo.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/sebereg.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/suwizuforan.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/46210260426.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/nozisusubavosix.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc697b6d0d---25773989627.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39346297c---76990237253.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/97657633475.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210908/files/20210908102851.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/32683301241.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/vuzugetavakiwosumerofuzov.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/54541788207.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/damagega.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pubekewawebawiwafix.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/tixudepebusifoxewus.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/sagezizuvopepusenoz.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/11069565353.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ppukj8stpa72bro7l9tc8kbgkh/zaretujelobase.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902082716377120.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/68495847067.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 11096 bytes
SHA-256: eb901c5d98fc8337791e52e8a5d6b1f4da6fe818c02b5a2021f3a7f6d17dab06
font_02_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 18676 bytes
SHA-256: 0dec6320c07ecfe8b9922ca749533746f55dde61c310f800d870dd4fcfd880b6

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