Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf50b9f10d0dd97…

MALICIOUS

PDF

74.5 KB Created: 2021-07-13 23:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 120dfc9b835aef3b4aac679c6b2c0f27 SHA-1: 092ca77c7a6827ff570260da9ddaf7f14c164857 SHA-256: caf50b9f10d0dd97ec7075c27692f29d5d883dc2c8696c82fcb5d4136541faa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160747118d5264---51271056009.pdf In PDF document text
    • http://budoprojekt.eu/obrazy/file/kixasurobafovekakelisu.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/81204642630.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pooifj1litus6nl0gl9b06te57/71870068508.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/dupafakenimamijewizovopul.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/midine.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fa043f68---vokebaser.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9ab54e532c149c9bd51ce4491a43d774/43499616594.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/5093674308.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/66115655240.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/fakirukakukotesum.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22c151e13---94063311311.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7jms6uobfhlvv3f3n48bb8qlip/gizazuritujubufusem.pdfIn PDF document text
    • http://btfa.tw/upload/files/77192174816.pdfIn PDF document text
    • http://wohntraumgmbh.at/tejureguxoniwesem.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lvvpmg1ktf382m58fum05ai47/mefigepixopivoziv.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/40h635hfqh41bort80m5707j7p/14104629517.pdfIn PDF document text
    • https://keongracun.org/contents//files/fagitiroma.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/tajitexotarotefezitani.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ktn9m51leeg6tt08idr6usfloa/57214207479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=excretory+system+ppt+for+class+11PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/66897761226.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_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 17264 bytes
SHA-256: 56a8cfdcec2783aecc1d5480a5e2d01fe77b00607724e0e5a289750f5b323954
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 10696 bytes
SHA-256: bc8a56de146885d7dd80b6e3ecb5197eff9cbd1306ddf68fa5c10132a945c326
font_02_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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