Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cc2fb759484624…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 18:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 90bae4eb05f4515471607b898cfe7bc1 SHA-1: 782287f68183a8e00d1210fe04ce9d227e153e23 SHA-256: e0cc2fb7594846246f87513bb0dafcfebe77133d305836107d2aba02143d3c58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many hosted on potentially disposable domains or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://4seasonstours.in/userfiles/file/94739968343.pdf In PDF document text
    • http://urgentcarepb.com/userfiles/file/53524223993.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161334603372e0---65901149555.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/guvikeponiroj.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/23849672398.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/donimig.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/86442900031.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/zukuribarus.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/volifakawejinenusujesas.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/80053486026.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/96631173309.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/45158285975.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092803050159311.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/65bb4e0f14024a0aee52e4c9b575ec8f/nuzugudopomugenojidenadov.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/dolanekirixasefefa.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/28892929251.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/43590675438.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/45098211627.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/febug.pdfIn PDF document text
    • http://schokozentrale.de/idata/junokix.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/letajuserotakirak.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/pegowamolefezoruno.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/52822657831.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tenelatitet.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/pijifevogowuna.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c1c73bdb---92787292670.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/6024127028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=head+first+c%23+4th+pdfPDF 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_off0000b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 10192 bytes
SHA-256: 93e92e36f243b713fea43bac4d60bf1c7b76392b7609bd9c491df15cfd23218b
font_02_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 15648 bytes
SHA-256: a3e3c242e32200eac2b8bfdc4888087f10d13448321c594f13306f704b09bb1a