Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9716dca4503a8e6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 20:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0129f3c73ef286f69232289d8ba0fb4b SHA-1: 5c24bd9ba8dc0c48eee37ed939bc6d14cc08b2f6 SHA-256: c9716dca4503a8e66d2c19e46bcbb46281e3e76374726f7b68af5e047c96f9f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=windows+10+best+hd+wallpapers PDF link annotation
    • http://khachsanmyngoc.com/upload/files/55068287749.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/saron.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/83131266228.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///24981469581.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16370f50---18031756539.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e308aae0---bikabarokerunom.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/13153545777.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/firewevapopulopan.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/74894209283.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/tibebunoz.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/29345830619.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/jitifusodajewaw.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/reluzer.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/74568859908.pdfIn PDF document text
    • http://lukinserv.hu/file/mananuz.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/kifuxufudiku.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909021948516431.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/levewuvuvimotiba.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/94167924482.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/50362878009.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/fqcbtm3dp64js26qu8dravk7oq/14025721388.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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 10880 bytes
SHA-256: f6a68dba1dba108a7f7cb5e332c6312eec3a2e3e610d0c17bd6f9d3fc7285751
font_01_sfnt_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 18704 bytes
SHA-256: fd0df247237a53667315aa4d1cb3240ad2834707d92c8cfec4bf58e6269969ba