Malicious PDF — malware analysis report

Static analysis result for SHA-256 049615cde55ad032…

MALICIOUS

PDF

70.0 KB Created: 2021-10-17 22:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 499959fee93bb6aa13c2644bfb2d5e5a SHA-1: 668ac6b7f60831ce49b012e12618824590bbe23a SHA-256: 049615cde55ad032a07fcc675d2db847ffdbcc282f73dc9f80054e7a25b6c155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is part of a campaign to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://langeline.com/ckeditor/upload/files/ladedawixupan.pdf In PDF document text
    • http://grgct.com/ckfinder/userfiles/files/sozasisujupu.pdfIn PDF document text
    • http://saint-party.com/media/file/5106621894.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/067f3634aef14d1766d55ebe1bd4e8ca/20142211925.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/rosuxabo.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/16171208746.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d7a50b3b6a4d7da900d87aa1914a8c86/levalosetadunev.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/rabavodizajeterod.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/silezoxexubifibegob.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/kunuku.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/lasesegexifikokolezed.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xipixubumuzovat.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/mewokefitovinejisukevaju.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210927113510.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/lixupebatinubebivobetikaz.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/zugamesutubofolokiboguj.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210921162605.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161498f56a9f9e---zoxaverib.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/2048603146.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/18663852678.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/67008696322.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161637f5bd57a6---tabimibu.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202110161520486691.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/15122716917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=anna+roosevelt+cowlesPDF 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_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 15752 bytes
SHA-256: 9e652a1d26917c62a869ecc4ad3c30f8a9be76da801f4eb041983f7d2a21b3de
font_01_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 10264 bytes
SHA-256: 4f8495854701b18d7643a45780baf4e260d3ee4cfc838d39657cd61cbbe2222a

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