Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c3322db6145013…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 01:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4316d0f5c35a8f967595d70980efd3d4 SHA-1: ae16dd6b3807e487d6f53ea0460d5c161c47294b SHA-256: 08c3322db6145013bcb7eb343f1c7c61b1087f4927f6a016df9475d958741433
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous unknown URLs suggests a broad attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9dd1189df---57574067819.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/xaviwagakamujafigejol.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/13341094216.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/vusadovomezasiz.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/1381296365.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/rawaveporapivizebikutuj.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4ddf2f30---rimedapuxesanedus.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sogijobilifata.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/50e6d1cd1d00d1e874781e86dc3ac2ef/govafifugaxaxukawumolujib.pdfIn PDF document text
    • http://willbramephotography.com/56068389608.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210829123234_1kcvaw.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/54534082330.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/054303c301d2b2ce77fde0f13a2cc98e/wegopetamikeluxuto.pdfIn PDF document text
    • http://ligneus.hu/upload/file/88080889771.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/jizuj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f8d4325f---15068337523.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/85846733727.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/47086526441.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/488213131b9e867299e1c70b130da5aa/fezifu.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/605000792.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/55617868645.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38267d615---75072844703.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badd4ddf560---mupafalam.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/20474102212.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b599b345---96371998593.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/93313227599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+can+can+jacques+offenbachPDF 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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 22424 bytes
SHA-256: 3f17e233ecac1109df508cb0e972501eaaf2d989fd671b15e7b91c5000a6a0f0
font_01_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 10576 bytes
SHA-256: abf8b4303883ff89f559c3c1ccbd53bec4186b3c7e3220a4f2282b9e30e29758
font_02_sfnt_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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