Malicious PDF — malware analysis report

Static analysis result for SHA-256 17654a21ef898987…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 14:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 459f7c457def59ff6875c8dcdb1ff829 SHA-1: 859e355cde324282de62cdd434673b460cba1cbb SHA-256: 17654a21ef89898796b1e9f835319f8525216352296b22ea906d21fc950b5b5e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaaea5b10---9350287276.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e9b44813aa395e265c7090e5ea62fab5/piropawufi.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/atjlugr9l8s77pjlgo2caempc2/dizevezujozosozosiwukuwab.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/90028642975.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5msohibc4cq7ufjuaibb8sg3r0/vudizev.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/64474247494.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/zufupedidunaki.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8481bc5b9b311909be97ff3e380b6a25/15337732062.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/34879219463.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080507583db1---69341861291.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e148a824a---vewimitoxogadelase.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/82747055610.pdfIn PDF document text
    • https://claudiodituri.it/uploads/vexomawatilojoliw.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a59ea4d44e133d92bcc22a24719fc8ae/23484264272.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/24785063071.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/54859162649.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/11616033950.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161113095a0f3e---gejizosamovop.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/goxegiwaruzefifenimo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/esjhc91otrpoq4m20turi1j91t/rakomejidupurizopab.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9a93c9e8e---57892992223.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3e78cd9662e39b02a67f7fff22b55dfe/58801827679.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/vewozokivumafafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=borg+warner+marine+transmission+manualPDF 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_off0000c109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC109 10692 bytes
SHA-256: dac692bd8f834239f067bfc5a8ef5bf40c8ffee6f33c80f21d24060a50a2f1b6
font_01_sfnt_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 18848 bytes
SHA-256: 209cae653dac54b8fddf94bf49a1d14176efab4094a96c557e923e6d91027b4f
font_02_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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