Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1af39cf08698ee…

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 09:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39db90518e60c3c94e3f4c39fac0490f SHA-1: 1fdbe2216f52a26bb37f8f8bd2c86d50544146a3 SHA-256: cc1af39cf08698eea02d96fff4f1dfa3b0953c07d202ac52f83b516490da8011
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, many of which appear to be disposable or compromised. Heuristics indicate this is a link farm, a common technique for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ehotelgateway.com/bot/ckfinder/uf/files/38392387312.pdf In PDF document text
    • https://senfina.top/uploads/files/88505130305.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/nakosapopebo.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/nijasakilorigovogedoza.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/3191153748.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/jegofatetenorejavi.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/24384951268.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8644c5f8---79276758096.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97018cea8---punogowofisojazusulurirur.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/suwomu.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/78375549142.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/30390719839.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2ebce86de5e175b7a7e490ce9be0717d/bidalexen.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/981ec7c6a0ca6be1b133dadf61e88d22/jaxipisil.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b70add77e0---fedoxoserevegavuwazaj.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105251209242400.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a232633a---78271535258.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b1c3de951---25495381884.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/3554678204.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49e4e4e5f---15461464908.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/70523575016.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/tunivuwos.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/14859478089.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/37866713046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=my+left+eye+is+twitching+on+topPDF 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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16388 bytes
SHA-256: 74dc292012e87b38a8dc10e8a3285dcdebcadbe1078e8e190c54d3106d17062f
font_01_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 10688 bytes
SHA-256: 658ab53d44dfe4f751bf60383814e9a3ba51dd5bf0236f03422ba84c8649b296
font_02_sfnt_off00012f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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