Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f20592003d0ecb…

MALICIOUS

PDF

87.4 KB Created: 2021-06-23 09:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5bf1b1143bb3362f11cdbe44666ada78 SHA-1: baad5421078277e1646fc3963105b28cfd7039e2 SHA-256: 28f20592003d0ecb8d6088ae7b86fc5943877809b615685d6d149db439f703dd
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of a raw IP address in one of the URIs and the ML classifier's high confidence score suggest malicious intent. The document's structure as a link farm is a common tactic for directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c46de8c8bdd---98895425156.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/be6fb57a747beaad59dde2135d2e04b3/wutuxuzoluwowexose.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/dalunu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210604_145300.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798ed0de5d7---fafelelugatotorumi.pdfPDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b0e069e---bedonazekakanumosanexoda.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/76517624327.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ae1li8o521fpb0r7vs2nmuh5hj/44189777951.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/562baica8emf4bpldqbrrqqkfj/25395871208.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/60092456585.pdfIn PDF document text
    • http://groupkaishan.com/d/files/35642839338.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/42246965013.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a207d69c64ae87cfe66c404814bd9c6e/zolufes.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/54878525513.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/gamapixejoxawifom.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/88ad81cdfd5240e9a05dee36550283bb/64249109646.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f33l21qga0ip6vcl6d25gnfdp7/gaxefinuxav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=before+the+pyramids+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 5084 bytes
SHA-256: af00f31fae5f09526c354e093b913540c3e29b4b24fb78deda4d6214da4f3a82
font_01_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 11436 bytes
SHA-256: 26a68cae32b345864fe69dc7fc6cb6c497f884b2a5b2e32764a3a2c067f75ae8
font_02_sfnt_off000142e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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