Malicious PDF — malware analysis report

Static analysis result for SHA-256 08372c9332093da1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 15:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d6837f7690640f78bc09378ef88bed9 SHA-1: a14c03da7593692abda0a3ee1a10b9f60d7ba29e SHA-256: 08372c9332093da1439bdf6f962ad2234fe1c92197ee54d7524a9a8dd587a703
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fast+and+furious+4+stream+online PDF link annotation
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/86533407596.pdfIn PDF document text
    • https://beaszemin.com/files/84150192913.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/gapipijupano.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/lifomizedo.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/natumikirusaxojigi.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/zoroxatebukoxujum.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/67848611549.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/80c7657a9ea1abc1e045a07688c95006/91863752020.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/didaxavevugej.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/67902739400.pdfIn PDF document text
    • https://skostishoes.com/userfiles/file/4534177667.pdfIn PDF document text
    • https://deepex.hu/hirek/files/71107664658.pdfIn PDF document text
    • http://sparkpro.lv/content/file/paxisusilolimisinonose.pdfIn PDF document text
    • http://floramarble.com/uploads/bixufufagovizu.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/083208_zuwudip.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/pulalupufadipadagudari.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/zorunapuroxisunivogadi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db39be7ed1---89078821459.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/baloxomakomixitokemosaru.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/soxowoloposowupikunapo.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/33761524095.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k1goleflg22v0fqv4sq1vmvm1j/41434049400.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210915093500.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_off0000b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08B 10668 bytes
SHA-256: 2e540d04a3d94dbacd4b96f9f179a483d22be8bd411369229141a600ea508f55
font_01_sfnt_off0000c8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F8 14648 bytes
SHA-256: 1d1812a48a8ed0692410f46967bb363884976a12d89f6f501ea14c8da1ee340e
font_02_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1