Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac17aedc332b97d…

MALICIOUS

PDF

90.6 KB Created: 2021-08-03 02:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b6e8d2229555d29aecf56e6d2d0e2c9 SHA-1: 08300653e0aa1497afdd74318a18a4c63feefc34 SHA-256: cac17aedc332b97d0985540711cf48f7923b565add81e0b200040692f6981f0a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gocep.org/data/userfiles/files/57333563527.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160943ed8507ee---78586893158.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/goluwodevamobilikopurab.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/atcvrk20ei6gfilr67g97ifln2/14380887574.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a07a551e7---dinudifigini.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/dirogumufuzewalazoxeki.pdfIn PDF document text
    • https://actor-conseil.com/files/file/27246194888.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/85807494023.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/sabosezevo.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/53212456131.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zisoxumelaxumufodefe.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/fekuliraropas.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/taxaderovanaratejiv.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/28202549802.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/46612889999.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7bc4e6a45---8284791570.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/40b38657fca0d2531a350d7e28a13044/xiwupurolezibepebejorusux.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a123a074dca---93244009429.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/15176554996.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/39883615737.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0330271146---nixewutanivasa.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/44983684802.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/t46s6h7qkurd4s0peukat26e58/dizilunis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+do+a+solar+system+school+projectPDF 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_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 10904 bytes
SHA-256: 5f8d051b41e0eec5a5b28341abf44c74b54d71f12d37129f24c7a9d5ee80f090
font_01_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 16724 bytes
SHA-256: 66c3b48bb9612134e49c366024b4b62e099acf9a20e76e70939c8f1cece565df
font_02_sfnt_off00014225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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