Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf33cbaeab3f4f4a…

MALICIOUS

PDF

96.6 KB Created: 2021-09-05 08:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e7d9216ce3e2e040296e1700f3f73ba SHA-1: c95c8b337425ba6cd67aa6ba366b24d36c1a8f69 SHA-256: bf33cbaeab3f4f4ab9f594aa32d3ed4d16174e883ab22f613b11d90a33387690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and embedded links indicate it is likely used in a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094029280221---96505818967.pdf In PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/12763174740.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/femazinaporebolem.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/51487076317.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2fadd4bc9108c60fef0eb33eda369d5/67748957558.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a26bb511280---tupigutejirenusitida.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/9625418690.pdfIn PDF document text
    • http://sdds.be/userfiles/file/23502473119.pdfIn PDF document text
    • https://kawanmto.net/contents//files/teluvafibobamedo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c0f0880967d31775f4e0aa17efbb2b53/71010381490.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/5279033420.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/87441400151.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446628c378---39904912135.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/waramawodufonu.pdfIn PDF document text
    • http://sjanzee.nl/file/34443174860.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/fuxujez.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086c15a63596---65423371309.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c61f70a46f4---derutikomabusogularija.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/91789048838.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174543f481---tesutuwek.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/75154902134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=18.1+electromagnetic+waves+worksheet+answersPDF 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_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 11148 bytes
SHA-256: d7bec427765ee41a3966cb5437549da8175baba6cfb6a1e1a4389d5de1a70bda
font_01_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 18624 bytes
SHA-256: b1add4edeee0458e522e85efb7fd8c6b59ecfed2fb21fd53cc306d93f95c175e
font_02_sfnt_off00015c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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