Malicious PDF — malware analysis report

Static analysis result for SHA-256 b718a5ade285ba05…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 05:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d7b57b06740cb197a877cc8bc96032b SHA-1: 639d5f5858f6f0427ce434e8d3545c55653d0cb6 SHA-256: b718a5ade285ba05490b2a68ae6333912af843fe1dabe6b29dd176cf359683ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links for potentially deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=how+do+you+get+rid+of+storage+on+your+phone PDF link annotation
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/nulazaruvox.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vipupexirolikabinawudazob.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/daxodugagirig.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/zojidixejubewexivi.pdfIn PDF document text
    • http://rts-3.ru/upload/files/25083353693.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146976f19778---95171981332.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/begatedovotoxowerawovavil.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/zorivubatisimupuxojib.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f6a9272c---rixamadobukalelijisije.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/96030528287.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/48946225419.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/73735626554.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/31512732667.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/3374578909.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/77824236277.pdfIn PDF document text
    • https://suruburi.net/mm/file/minopokutetowamumerosod.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mt2g3etv2ogvike8pvrtgn5105/puwelivafibuzuvifitinogoz.pdfIn PDF document text
    • https://masukpt2.com/contents/files/madogefala.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7b688e99---likurokokimotu.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/29535783119.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/74334227413.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/6125213183.pdfIn PDF document text
    • 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_off0000b3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C6 11020 bytes
SHA-256: 6902d37fe8f0430e9a8592fd5f0907dfec672be6ec3190dd7ff92cd793347b06
font_01_sfnt_off0000cd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 16232 bytes
SHA-256: 7630f7b5007716b00f0b1ff27bb0a8fa7b749ab31060ea85531d5490424e4398
font_02_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1