Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e199116b7bfbec2…

MALICIOUS

PDF

92.7 KB Created: 2021-09-07 14:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99fe0bf402e2a95636b557652581bdd3 SHA-1: fea8446872ad1f351515b7d81d88cdc3550f86ce SHA-256: 8e199116b7bfbec258a237498ead906685ab706b5d986de09d10514306ff145c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified it as a link farm pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3283dca2f897a923775f749c8f20d7a/didixefisopitizofejis.pdf In PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/45934368780.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31036306553.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/oimfsqm1fm2pll38l3e5q5j80k/lokonikud.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/eo48ovf0os9qhus53ldph8m5u1/melekejezile.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf489c797---zewidonimotenigumezasozel.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/muwojazisegafekabebav.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529013105.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09e71d67f---ranufivomo.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/86596967452.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/jepedeguro.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8445292e6875ff7df350911f0d393c6/9702323245.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0319cd4ad8b310d849ddc6a8e3b2bbf6/45289650581.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jvr25lor4dv1dok13218ojh232/fuwevuvinun.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/50202787815.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081812282655627.pdfIn PDF document text
    • https://hse.tw/upload/file/josudeg.pdfIn PDF document text
    • http://abpaluso.com/upload/file/42194705503.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/wipagaj.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af646d5100---10504655306.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc8d3cd81---degalofumubamevadegofenif.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/zilitajutajesejetaziba.pdfIn PDF document text
    • http://artospace.com/pics/file/50200780875.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/kepifita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2015+gmc+yukon+xl+owners+manual+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_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 11600 bytes
SHA-256: 53a7785e81b2bc2301c5f467cba12982ed114a84af21c5056345ba586d54a974
font_02_sfnt_off0001357f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 18040 bytes
SHA-256: 1f609e00164a55cb05b6e13e1e4d32250bdfdd12bbc90782cc724b7b8a6afaef