Malicious PDF — malware analysis report

Static analysis result for SHA-256 c119b154654f4146…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 07:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61f624d384fd8e791af49cc127378e7d SHA-1: 09ba94637454df083b0d4a71bacf0ef0fb88103e SHA-256: c119b154654f4146230469bdc0842a36f9c0ed8d91bd7d3a43a06ee44ed19460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://namadagaskare.ru/ckfinder/userfiles/files/gunepuvapasinibituzekis.pdf In PDF document text
    • http://omni-links.com/images/blog/file/61980295777.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/posalapexojivamo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83814072661.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160928a8b3b15d---47523517248.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecaa607827---xubomewin.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/xizikuxorudaxerejuxobaba.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e43d17c40---18637014761.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/42711125000.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/66000872748.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/xozoba.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/fibagenikirokexepur.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd53669bec---voxewuwejopojo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/girolotisesalol.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/73072660972.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/29430118520.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/46138722350.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4bc329999bb061552fa6c0ca1eaa1a52/3462995489.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb7c5ac101---diwogamamozutaju.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/zisifege.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/sivifep.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/3581406285.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/90692220115.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3c7ca184684156c020f04682104e17d6/40387507269.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f74f2cb0---19956764504.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/lelatit.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/30415766044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adobe+acrobat+pro+dc+pdf+packPDF 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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 10416 bytes
SHA-256: 05c70e2949e619d865b8f9b4bb7fabd3e243fc8fc8fab2b8b1fc3942e90a8f37
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 17496 bytes
SHA-256: f7bddc2d1a4fc6364dc47c31a1074d3ba6a79c8bd398ac4f3c9bc1fdfdb1f5b8
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1