Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6c5b7c735a541e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 22:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52fc2d4e5b8169460c60b7a203cb1a6b SHA-1: 297056d65e7b8ca07b93249073fb6b287fe3fb47 SHA-256: 3b6c5b7c735a541e83f25118fbcb7163104acc5dbe769e52cae71c842b9a7283
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8918

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ezstreetautosales.com/clients/876244/File/58991548689.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c222c107---33581648743.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/88138606333.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/15240574698.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/561jenpeou2g9q3qse1m3mv865/35475335192.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/33920940588.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/legikujunonoviviwu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/gukabunexut.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b331f77396---savevuwatomo.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xiwoxapodunitoj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bdb523f57---13277589122.pdfIn PDF document text
    • http://beateromer.com/bilder/file/sexidomefuwulemom.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/nipazevusemoliwinup.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d777be5e33---gelovujidimiduxotupebovi.pdfIn PDF document text
    • https://beltamas.by/content/Files/wudutadugevebowasabud.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/39336216948.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbad2bd73---voninewig.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/38200794957.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/fuxuzivizesaturi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16070f682cb710---80121724368.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/74849035767.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/lubiselizolunukofus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=witness+for+the+prosecution+script+pdfPDF link annotation
    • 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_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 17084 bytes
SHA-256: 034a968ca7f8122d180f6e086660bf6c33692ebfccb99018eca5cfe2debeb124
font_01_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 10604 bytes
SHA-256: 9d1baf3ecacd72f330498f26d669af6b8b43817a582a5586c6444eaf6e1bb9a0
font_02_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1