Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c9cb12d839d3da…

MALICIOUS

PDF

73.5 KB Created: 2021-06-26 03:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b0dfcf82cc49f5faef33430f7dc53e9 SHA-1: e193801dd8a471d88b5ac7b35551d9294701f3ec SHA-256: 93c9cb12d839d3daa339a6815a6cbff6b595a0a9b79e4483b79dfe16fbd54f68
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608669ce0af27---sawomejikupax.pdf In PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/67350881637.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a0f41d402bf6e913a8cdeb5c871c1081/71936323308.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/relimafomijemonubat.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8259a5c2117f42c02267c3cca92de56a/mapogerutuxefaniwarik.pdfIn PDF document text
    • https://ikima.fr/uploads/file/boxojutexabamowoxovideba.pdfIn PDF document text
    • https://andana.us/files/files/murujoxobovifudajidanasu.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/59702489754.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fufiwasozinidudojor.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/66662656198.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/98900684878.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/304578415.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/65038229750.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/vezexajoxam.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/24727257a114815aae1bdfb69d95db05/jazevakagor.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/27640556385.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc06e042929---72428092513.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bd193104---64303948414.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbb8cca69---dinudus.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/rigugogelolamememetevo.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/vemeri.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079192358218---67645968791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=universal+declaration+on+bioethics+and+human+rights+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_off0000bb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB38 16472 bytes
SHA-256: 3aecf2441bd1727384a6c1476b9adb831b822a38d2a2276d7679545828357173
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 11380 bytes
SHA-256: 4b74ebd0c4991c2a06d932f2b620135e0fa09783bbdf3be00a3e2415616a2006

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