Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b946cac46d35974…

MALICIOUS

PDF

79.8 KB Created: 2021-09-01 14:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc0e7c7b367dcf3fd09f682f8109ac16 SHA-1: 9d221c837b4abb3e14cf1c489e0412e07fe9fbcd SHA-256: 7b946cac46d35974c605d2e0a1f45b5263367f301c6cdd954b7c9e729450f9d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple unknown URLs and compromised WordPress uploads reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b133b394717---nenadibodevavixojuzibu.pdf In PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/voridew.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/39312441585.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/81745043543.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/tobeduzivopuxejimumozon.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/lifuxemo.pdfIn PDF document text
    • http://artside.org/data/temp/file/94732740919.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f94c806dc106b60e8756f2ee48f875b2/porojumiwagemosolelusix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991faac0372---mivifevilajekumub.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f19df6c9---88598766560.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kexibafawu.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/boramute.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16075a33cbf5a6---16974715734.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16123477a38065---97653822605.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • https://nomortiga.com/contents//files/33373038769.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///fuzukutifa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kqr8q3bu0hhv83fdbhljleqre8/90343406778.pdfIn PDF document text
    • https://shopabrang.com/images/files/polixijup.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/zerirevos.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/297beb7a20177f59c003c085101da0db/79492016606.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/17244481757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+center+for+autismPDF 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_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16984 bytes
SHA-256: 361e8047e7fcc601a3e6b13a00394499e83802a8b8e6d16e83558e10d59ecb0b
font_01_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10620 bytes
SHA-256: b229d8ee0eaa72dd7ee7064e350d47d643a926f5a1a1f156478f1d107ec2c32d
font_02_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1