Malicious PDF — malware analysis report

Static analysis result for SHA-256 987ba41e1e3c5acb…

MALICIOUS

PDF

74.2 KB Created: 2021-08-07 01:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81183af82fdf9abb0daf35b76056943a SHA-1: 8de172588b4235d9dd2723c1e22a7a49bbca3330 SHA-256: 987ba41e1e3c5acbaa7346de14ed3abcb52b0e252581ad40a48806f88a517abe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://jan-fotografie.nl/upload/files/6704240059.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8i0bidlb5ifr5ljncg5q8uea2h/87496827422.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/76427103799.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/mugiku.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/nebate.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/zawalogirimorupix.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ada48aae23c3b292208591e2f4294499/dapewosidakek.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/savosudarigemitup.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3jboamoe5a706jdukn4k6itv0p/15841323317.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105bd5a83b15---95857890272.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/70488476579.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/52675124032.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fofaximatiwavofulovunoxe.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/virevigitidovilejutara.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b0297b2665166ed443e77bb49271eba7/45318251992.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a05e51caa4443f0efdd02f5d17c96c75/13952803089.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/vulitinufamem.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/87658488232.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/22797578622.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30838ac8c0---3983478937.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/povurarixena.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021615035242314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=taylor+food+scale+battery+replacementPDF 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_off0000bede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDE 10908 bytes
SHA-256: 93019846f5614076588823fe979cc01a5788b5cabe5fe8ad9fc6e2d952d6f27e
font_01_sfnt_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 16580 bytes
SHA-256: 99711f31e67b584d65a62750ef2c4c0f1bc90bfc9d3db2056956326c3d9fc384
font_02_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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