Malicious PDF — malware analysis report

Static analysis result for SHA-256 7049c0a9e5799f34…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 17:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f74fb873959d354636bab07ba9008cf2 SHA-1: 2d26fbea34ca5dd73d29549e54b0280271385cdf SHA-256: 7049c0a9e5799f343cff2b4106e27cc8858ff1b62f4f598271a756409277d6db
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://capital-publishing.com/ckfinder/userfiles/files/sezapukegavutiki.pdf In PDF document text
    • https://evermoral.hk/upload/file/1631256327.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097b0981e2---buvivavufa.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/61102769235.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/nitobedetujutojabeponar.pdfIn PDF document text
    • http://electric-kernbichler.at/70426066877.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/14591872422.pdfIn PDF document text
    • http://bankerz.in/qpic/files/68155382964.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493684c090c---61320268100.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631193646.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/sasuw.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/26133516229.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/92b9cb5fce5a831645ebf0f6492ac64f/60262561182.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/sogokararaliruluxet.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ada9e803405b4aa31a327b636a512f9a/xubulakidulo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/43074888715.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/derurure.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/21317893476.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/zuwikuguf.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210917104646.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/77222200952.pdfIn PDF document text
    • http://podushka.by/files/files/68318349621.pdfIn PDF document text
    • http://vhz.cz/user-files/62471260768.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/24667203858.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5add9eb6c20d2fdccf1ad7e22233e1c0/69797367394.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/36478809857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=blox+fruits+codes+2021PDF 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_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 18968 bytes
SHA-256: e770d747fa2634a16ffe00bdee42945bea1ed6638474d146c9e0dd61657409a1
font_01_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 10752 bytes
SHA-256: 13f0607ea79a5e193928fc0d6470bc866329e047826c7a6aeb9d65a41ef27c90
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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