Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb31f4ab9ed7fa4…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 13:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5634df02e7ac6a37fbeac2ed6339538 SHA-1: 725438995344dce147b1d3af968c50ed17a4e7b8 SHA-256: beb31f4ab9ed7fa4d2abc684b842b230799cbc5fb4acd0e5015ea7587220aa8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely involving a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rgd1dvf81se3dj2h3kr62a7bt6/resimar.pdf In PDF document text
    • http://northcity.rs/slike/files/61335927700.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/tajebijepedi.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/veralizajusunidibusami.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/judapojelikimesujupegeg.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/36032338211.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/40057799266.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/rinowibaxidakelegavipu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d33bb244a7fb53a81fab463850888d16/45980335713.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/redozimapumemitasof.pdfIn PDF document text
    • https://geniodelweb.com/file/84333829634.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/67245964214.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94b42224c---xefavivegenubu.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kurixobinusabakutopuniz.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/xetotafomituneduzifimaxeg.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xagorugej.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/pokakigivamunetepedofe.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/65151484789.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/61125370268.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/47613031421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=myanmar+vpn+lite+apkPDF 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_off0000cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC02 10388 bytes
SHA-256: 8fbe37a8080c0c18308f29420450cea8ebce02fe526cfb7217e794f51e4a4a0b
font_01_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 19136 bytes
SHA-256: 7aff634e4dd799e4db42197e84181829eb5ea2c1afdb8502da9516388ab21929
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1