Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c4e8b373854641…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 10:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd6f46f8a832abf32873cc1835a47f5b SHA-1: 57901644cec71d4781cf6e4ca350c1740b711014 SHA-256: 44c4e8b373854641457d2e73656c54f57726ab962fa240fb5240dd5140d7e7d3
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, impersonating cloud document services to encourage downloads. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest the PDF is designed to trick users into downloading further malicious content, likely a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://thietbidiensino.vn/media/ftp/file/82237905220.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e6ce1858b92eb6d2047d3fb7574570ea/nedepegurajijusaj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f76c682546---24576659799.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1611c86110a111---ladiwedaraxemineneponi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa663ce5afb---83312555188.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c139474f049---misezawesikekagexege.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/58837448600.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/35964697787.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/68ce5e188921531c82e500c37f889016/87706527113.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094acdbbfdcd---rakifewum.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/zegapexuzapoxubiza.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/6352359222.pdfIn PDF document text
    • https://songhongresort.com/img/files/lebadorufakuta.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/79920998538.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7nuko31mfbvegu70obuddd5ue4/53479092141.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4328ab86327cd70f7b09b4bd0f55b487/25480606480.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/83987132282.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e29a986818---23168871039.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/34693817177.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/79214843108.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/t1gk1shd17ktrsc4b86f7kjvu4/rejeziwijaxobakuxubuliw.pdfIn PDF document text
    • http://garderoba.sk/images/_file/fepaponivojakabilegux.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ab02dca33900018955572ca241abe474/biguxujizosusugewojaza.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/wasemulabono.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///31361447789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adobe+reader+join+pdfPDF link annotation
    • 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 18504 bytes
SHA-256: 12da67a8502a46970a06ecad1104fd692bb508c42ce90b3126118fd9453f9a2f
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10432 bytes
SHA-256: d5587eecc0d9aca4f45f532f288898d448a6dcbf4fa4cf0c70c3379314a0e3bd
font_02_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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