Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7a1ec6d03e4741…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 06:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2a616bb0ff7bf72f6f2032e78def6af SHA-1: 4b956c5cc9859a698418f6fe1f72124703da3af3 SHA-256: 4b7a1ec6d03e4741929364fa31187346ed0d53b65d248f5284ce41e53e7492e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wwsm-hk.com/files/file/majalazonunezija.pdf In PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/wusemapesur.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67943056463.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/50777496657.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/lipavawo.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pivunixubojudorin.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/87451018854.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vikexemebuzuzowibisunat.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/rolulediwivubagenawe.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/vojufubin.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161362f3b8e383---renurijabisabedokewekek.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/89676abda048a67d185abda3fb5340fc/timufekaliwurebevoj.pdfIn PDF document text
    • https://sanidom.pl/img/file/rajiwi.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/degamerijodarixitameket.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/51039328789.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/pifavexadolevogijubo.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/2109041521028775003e2ye.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134599447a5f---jiresul.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109042251107930.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/lifidowirutebeta.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/suwez.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/rekadoko.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c3ee9288a053ae05bf88ce0a29c0681d/lawizatokomoveder.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/98849547880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=live+cricket+match+today+streaming+onlinePDF 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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 11048 bytes
SHA-256: 6b15d0e6e49d6df7c9b6b7294aab35de8e7f4f8db5f3a79a93a91fe92ba4af01
font_01_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 17244 bytes
SHA-256: 06bdbdf9ac9b53f80a6073dc17af577269a9254849bace99fd0734631984a624
font_02_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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