Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50b5e951e1bdceb…

MALICIOUS

PDF

74.2 KB Created: 2021-09-29 01:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0783409db3f4b79d755d127fb68fd5c0 SHA-1: fadbb21a831ba3a810697f9973d6cc4036b91a10 SHA-256: e50b5e951e1bdceba64a24e583aed9239d14029dcc17ff11ba0414fbd16bfd9b
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to use these links for SEO purposes, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://butterfly-propertymanagement.com/userfiles/file/bikidijag.pdf In PDF document text
    • http://chinalabware.ru/d/files/vodutexatafemajuk.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/34876143033.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/93673313926.pdfIn PDF document text
    • https://heureka-cz.eu/files/vamedopatutoxup.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/4394786532.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/55571562945.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/tawubu.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/sumunudajepulorof.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zozerijegafiwokazibijoriw.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/wawiwivasome.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/didofewezagetowupezoz.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/67121254580.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614923542d607---mamudaresutezapewar.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/wufaxej.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/59399868661.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4fab9776c---fowomutuvanasinobol.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5839f36ba3b4865d079b14655b562bb7/278692898.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/kopimosiwa.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/62710217029.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/debowagevutatejaguwokaje.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///fuwajiminizusufos.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/pokuxevuxulumakuvofudok.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/30853238504.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/lokasife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bookworm+free+downloadPDF 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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 18992 bytes
SHA-256: 0e04eab6248fa5839766ab8dc31d548959594da745df263fc635fffaba4ff210
font_02_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 10388 bytes
SHA-256: 21b4a1bff916f602a4d064d4b50f753d3b17dfea7812626e1b87bfe06ab9de09

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