Malicious PDF — malware analysis report

Static analysis result for SHA-256 587180f559dedf7b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 10:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88e198bc42559c0cd9c5b7713b5bcba8 SHA-1: cc2c0ee4bb895f6aa336849af14e17ba4e53586c SHA-256: 587180f559dedf7b884e8a101bb4a8fc4b7a04f04edaa42f943ceed78c8a2054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thetsaban3watnuea.com/UserFiles/file/34095092234.pdf In PDF document text
    • https://mvmdigital.gr/files/files/10034130153.pdfIn PDF document text
    • https://stopserv.ru/files/file/sameribaboligabelurefad.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/689621885c1ca3feb9708471426176b2/bitolixuku.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/sazuribitobisefawabuf.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/61065051016.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/48187983695.pdfIn PDF document text
    • https://cartolmania.it/file/sedilebok.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/88426782145.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/jexixubonaxigedetutige.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/80413726041.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363530b1762---vewojuxozezatopegubebisux.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gelivejipafar.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/71514867971.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/59720563409.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/56717309086.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/ninedijikizopa.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d5c6d4d69a8c556a8f9c61efc46ecc51/notapubidodegosek.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/xurodoxuguzowid.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/76518100111.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/lotijikadijadenikokaki.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8a63a2fb---49012413956.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/67333707210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+fifty+shades+of+grey+freed+online+freePDF 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_off0000b6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 10864 bytes
SHA-256: 5ab87f11cc53f24adeab3bb599317e0dd0101b328f3c46895e2a49e14f38c884
font_02_sfnt_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 16356 bytes
SHA-256: 5720739a1d32fff3450287e1ae602cf233a103923829956711e5584bb6d98fb8