Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eef1971e11e6163…

MALICIOUS

PDF

74.1 KB Created: 2021-09-10 09:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ff4018e6c3b2d5f37bddfd81fcdf9d4 SHA-1: c1b40469b1b4cd17417133f03c5445235bd8a93c SHA-256: 3eef1971e11e6163d06ce297777ae28c5d4c8aa0a1f0f0b5b4d208ece8a91c7f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alianzablue.com/aym_image/files/81755278008.pdf In PDF document text
    • https://daotaolaixesontay.com/uploads/file/zafamozolexugubo.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/46649380625.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/togakaboku.pdfIn PDF document text
    • http://www.depomatrial.com/file/nibejujebuwatokedufejero.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/58608098848.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/xesitajumil.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c08d6c49a8698417a63e7cb2d8d6e4ba/65788503972.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/repofe.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/buteranumowavex.pdfIn PDF document text
    • http://kammed.com/userfiles/file/48560952407.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/pubirazibepowodididogub.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/71701869119.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/verumusadoza.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/runajevoniz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320bdc9c192---kafugepiga.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b153c40cfae6a8c63c89db44d62f82c1/11328633369.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/34041841503.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/kexofopezixufipuvoza.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/93427683285.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/82777860950.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/25321629031.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/65554442453.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/59554223928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fortnite+apk+windows+10PDF 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_off0000be57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE57 10668 bytes
SHA-256: 794b59821b4abe614aa809fb844158ce121fb1f01357ac27b8022c739172b809
font_01_sfnt_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 17000 bytes
SHA-256: 83de47e1bf206e8704fa3b456200fefdb3aa9128fdc89f8eb89adc2544621a87