Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a47e2b0ec48b584…

MALICIOUS

PDF

89.5 KB Created: 2021-08-12 13:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9b097a58039042e119a53a618cdfbc8 SHA-1: 8752ae8e51b2ab050bc3c26c6d148ece3aff0861 SHA-256: 2a47e2b0ec48b58495520ab2ef56950ae99e957c12d5a5119d9f23383cda293b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm hosted on compromised websites. The embedded URLs likely lead to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=fundamentals+of+signals+and+systems+roberts PDF link annotation
    • https://www.winsum.frl/ckfinder/userfiles/files/simijogewofegujarutep.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3158ca4e9f46a035e0aa873ee0ce7fc7/mimazuwidegidabepefojibar.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zolekubepetabakag.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/82450471243.pdfIn PDF document text
    • https://birudongker.com/contents//files/31924782752.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nizanudofi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c583a9da2c1---54436601969.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607c913168a91---wapapogamosefiropuwiw.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a154d735424---59930564958.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0fbdd84e---32934463731.pdfIn PDF document text
    • https://qnzar.com/files/90119247720.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/mexununupowakoboditakil.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/20456353128.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/1707128769.pdfIn PDF document text
    • http://allasclub.com/campannas/file/wovarejesuro.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/92fc3d5bb868fd91233f7e2ecb5b3d44/gejezotizivudilof.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/81471585895.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/futugaweletuguzixelar.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/muromufepon.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3962331bd0---32055310706.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kakofupanugawobi.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/pokaxamugej.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/81130835676.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6808c3d195---91126504559.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/45416061875.pdfIn PDF document text
    • http://orrizon.ru/images/file/89274748133.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ff427e7d---38042539651.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_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 17808 bytes
SHA-256: 7a906aed4fcf5f093c68a4de663877af8df8d61900665394dae74dc9ce85bc40
font_01_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 11028 bytes
SHA-256: 8742e797c4af6a36fbe08e27acef8f47e72f5c308c1d9442b30ff14d3595a48d

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