Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc3b0877feaf231…

MALICIOUS

PDF

87.5 KB Created: 2021-09-22 10:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6062b1e0e950e18983f5555269821826 SHA-1: 5becf73204226ffb15080610b8ef138e6642f4bf SHA-256: bcc3b0877feaf23126023b79eb4131a643883a529bae08b2abaa5ea88bdf3db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://chcial.ru/uplcv?utm_term=jurassic+world+evolution+for+android PDF link annotation
    • http://friulanapanini.com/images/file/paxumazav.pdfIn PDF document text
    • http://novafish.it/userfiles/files/99506500257.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/17481064576.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff2c9b94a---darezipuwexerovin.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130698259ff6---bikanokemajodakuvek.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/bosolisaruvikufun.pdfIn PDF document text
    • http://rnralpha.cz/res/file/dawafeturamod.pdfIn PDF document text
    • http://risme.vn/files/624290613.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/daxawofekasirajetofaji.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/wamubadexodixewix.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/xexusazo.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/levinakulozivad.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/44161837326.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28737259518.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/norakisoz.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/5964897176.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/soremuloxize.pdfIn PDF document text
    • http://afinamebel.ukrkarta.ua/fckeditor/userfiles/file/jabuvefadiwepifidenutoz.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/19390477489.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/pigitakiwuzogefo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/65428375338.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131863341fb9---38578016760.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/jemekorozazafopeneram.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4d67f67e---fexofotisejubasolomukuzan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10712 bytes
SHA-256: 35b02a4887660f846eec0caa7166c9c9c1302575f6ed81685601e7fb75821c4e
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 21760 bytes
SHA-256: 134eb384797b4d269baa78e36a1a3ad48d6335fe4b2d1427c506d27be6f0e086

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