Malicious PDF — malware analysis report

Static analysis result for SHA-256 8442731727907ec4…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 09:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b070ace64cae8273e1f9cb40968082ef SHA-1: 34ab43aa1f2f17d2744ce6c159d289b47c1e0ea1 SHA-256: 8442731727907ec402c7f6961e0e90fd126516f5bc02e43d46310fdb702feae6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or malware downloads. The PDF structure and embedded URLs suggest an attempt to lure users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=new+york+movie+download PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0de72495---mujas.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/79609094882.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/45e426aa3b4098ff23c9524df867e519/bozinot.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/duliwibasaguloni.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/pewavopekesi.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/80830089213.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a126eb302---bufopewazutuzupomuj.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/gonifa.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mutelimofadesalipanu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/lusutiduwivox.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/jogopizofaledug.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/fasuvotawixokutimisixigod.pdfIn PDF document text
    • http://didula.com/img/file/vuwejuxesokabagogigure.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614901bf455dd---91192258492.pdfIn PDF document text
    • http://fruitvita.com/files/files/kizalibu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/vanukosi.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/91471583692.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/turabatabijizajutuwemixed.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/82615164697.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/rarotexosifiropogubur.pdfIn PDF document text
    • https://tdfstore.it/file/lukewatub.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/34373724.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/vuwijovifop.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/95501876212.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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 18980 bytes
SHA-256: 4e4e228c2c4c2e343fa9d6248086bfbf751a31d78a371e8b313eec3714eb1c14
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 10480 bytes
SHA-256: a9bc7fa6da9e0b8b886c08e91e0fc7e4ea11b8623773d09329c28594a91ed2c8
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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