Malicious PDF — malware analysis report

Static analysis result for SHA-256 b242762f32a299cc…

MALICIOUS

PDF

92.0 KB Created: 2021-09-07 09:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b04e6cd45223f532343bbfd47a1d62e SHA-1: 224c07a36acaa573d722b21e4178f6abaf9ff7a9 SHA-256: b242762f32a299ccbff272be9a6926aa7a17a0244ef03ecad5495fba133aadc5
156 Risk Score

Malware Insights

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

This PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kiddeefire.com/media/userfiles/files/7511575430.pdf In PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/53740365146.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76a0aa13c---90413105029.pdfIn PDF document text
    • https://paperland.bg/uploads/file/bakodajusan.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa563c551dd---50977998572.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/64acfe0bc113a23ecc3fa3341abf2552/66607371937.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/30695142800.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112960ab4ef0---53245012722.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/84014754186.pdfIn PDF document text
    • http://halaljones.com/uploads/files/tekozebumoriwatom.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608506f6db227---81031408309.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8d925c6073a2f2c016fa69a4ebc32e68/gusigedinujolasixupoge.pdfIn PDF document text
    • https://arerp.kr/data/file///44615124313.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fepivugexepafujiduxajo.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xubedorutumowopu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c4a54eb731d5953e1aab87685118d871/1116227037.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/gatawurogivifim.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a3cc91b29dbb1564e4141d24e4f25b41/30329048676.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40290515481.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a15c383c---54711613609.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a40789310be---12522988740.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/gusirawunameb.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d7262193ab7---34420889952.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aeec36e44---befusakas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cover+letter+for+accountant+job+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/nakerilixegazaj.pdfIn PDF document text
    • 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_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 18784 bytes
SHA-256: f485c582bcc5db4e5024bf60bc7632c3c5e373aaae672a636ead9f3b73d14323
font_01_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 10820 bytes
SHA-256: 4a8d36f6c9b00651a1dbdc1e5912ca01f4786c919f4a5f4cf8ba2f03cc733e55
font_02_sfnt_off00014a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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