Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bc6b00de75e955…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 09:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41ae50d0d06d91cf5cf24acc121d6e35 SHA-1: 85d04f2b9ba6433d943ec77e74a2400f9a717473 SHA-256: 10bc6b00de75e955a4148e8d049f79e0009fa7bfcc1c6db87772bda0d78995d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly support the conclusion that this PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=pokemon+black+ds+rom+download PDF link annotation
    • https://n-tlg.com/files/file/jukomol.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/85397736479.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b656e1b19---tiwutekobuzejisez.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/55016182767.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/mumonapetesozikaw.pdfIn PDF document text
    • https://kermanrooz.com/img/files/pumiselubumosa.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/36928878578.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614188a921491---17004484611.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/loxaxejisi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb5d7ebef---15349390096.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d177ff20---94525233887.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xaserosapan.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/gevosubumaradat.pdfIn PDF document text
    • https://plasy.com/uploads/file/nekow.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/38354670349.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/55044208576.pdfIn PDF document text
    • http://didula.ru/img/file/16115815347.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/35983763440.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/28695092141.pdfIn PDF document text
    • http://js-space.de/userfiles/file/ritaforolanases.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210913_2AC430232ACA71AB.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/64824315098.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/rufixukewi.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/63307150249.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/wikuxo.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dezifas.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109091814399979.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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 17968 bytes
SHA-256: cfd65f6d4e3c5a40e8f075a41959b91589338a13570d84ab78395692ba92fddd
font_01_sfnt_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 10660 bytes
SHA-256: 1a91a55cb9bea583bdfeee645eab65f5d07c839f29697aeac21a93239c71463e

Open this report in the interactive analyzer, or submit your own file for analysis.