Malicious PDF — malware analysis report

Static analysis result for SHA-256 c914224c698b3c72…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 08:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f19f5ff6bfff4b978feadba930bf6e4 SHA-1: 71575444bb6e4fdd37dffc5368c87a9c7c9ffcc2 SHA-256: c914224c698b3c7261f2e7c855dfc53ec7ad7d1ac6e67abe8e15296fff7ee13b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=privacy+policy+for+camera+permission+android PDF link annotation
    • http://52fotki.ru/ckfinder/userfiles/files/21627085555.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/76703253198.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wujobesosawilanotigoxu.pdfIn PDF document text
    • http://livestocktool.com/d/files/40039931043.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/95514099124.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/91084479786.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/32989889612.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/dovijirulober.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcbeb8b64---binuxuzebodukowamaw.pdfIn PDF document text
    • https://kenadong.com/contents/files/91427041070.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161419de5261ee---sakatowovupuzo.pdfIn PDF document text
    • http://hijoin.hu/editor_up/rekalixiseridozepaj.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/naketiji.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fe55a214e---77628192121.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/modarumonobofisujude.pdfIn PDF document text
    • https://clubon.top/uploads/files/pejumuk.pdfIn PDF document text
    • http://vodova51-53.cz/files/57328102683.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/zavubilipitijugefajuxo.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/dipadodimabelumobemewo.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/23300965843.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/pibif.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ab9a9d9fc---biwasizof.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/75996576947.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2c131mm1t0gk8r12ercmcbn0v1/27341627090.pdfIn PDF document text
    • http://seritour.com/rsm/files/fofamamudaduli.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_off0000ba19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA19 10864 bytes
SHA-256: 473bf9c9d88a025004f05a6999bf24b61c874b1eda7f3658e08df75962462b18
font_01_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 15016 bytes
SHA-256: f280e6aaa94f77b49a1e2021094fe5fc5c4f3dc9b5f8fdaf4e395b43aaf7983f
font_02_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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