Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4dca87e842e6df…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 13:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d9d993975d3f1634f74118eabf8cf19 SHA-1: 72e5790eb9a9f88feedbea09c6f38c39fc487e74 SHA-256: 2f4dca87e842e6df60425b3c8d811f59c387fdb78493d40430980266c975065f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1d3f2b1b4827dfc1e3db2a8fe482958f/tigiv.pdf In PDF document text
    • http://andlupa.com/userfiles/file/rolakuv.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/losarir.pdfIn PDF document text
    • https://iword.de/userfiles/file/ditatud.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kibagobajoxu.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/88146001962.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/56699153444.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/gukazadokozexemiwivo.pdfIn PDF document text
    • http://sushibelovo.ru/files/wixaxoteripuwubunoz.pdfIn PDF document text
    • http://cold.lt/userfiles/file/18299118189.pdfIn PDF document text
    • http://turnyras.lt/Files/file/37867667008.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2695c712fed8d3c54c3fa4b72563cb7a/70268182354.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/nuxutofeduk.pdfIn PDF document text
    • https://campermagazine.tv/public/file/47254328216.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/15094571282.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/29723920494.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901115118.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/15280777303.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/legolo.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tugiboxuzakixudadutakod.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/905c69201626dc6ecf8458cd8f9c7e19/1887337475.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/87624096357.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/51563896488.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/86231359623.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/guzogirim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hobo+life+apkPDF 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_off0000b9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 10104 bytes
SHA-256: f6a9589b374305d5888f513333d0c6606b3b9174ba24ac4dc50899c308884a20
font_02_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16848 bytes
SHA-256: 0e3433a5d37b8d37ed70d4a49ed717f12ec94dee37c7137d5bb2b60745569a71

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