Malicious PDF — malware analysis report

Static analysis result for SHA-256 91735c9a27c43b1e…

MALICIOUS

PDF

85.1 KB Created: 2021-07-21 07:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 70c6cee5384372eb5459f0f7119c14bc SHA-1: baf6af1e7e3efdfd9103def715920730287ad3dc SHA-256: 91735c9a27c43b1e572829a8049ac8e98c012b9c80b87adf8494dc0274670d1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous websites, many of which appear to be compromised or hosted on disposable domains. These links are likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://alphabodysupplements.com/newerac2c/userfiles/file/turer.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f32c5bd9a---figiruwuworu.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/wujosomelokose.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jipiut3pp2outal0f1po4b0580/86742854874.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/107742a592a7bf1418ed064c1263198f/rowozuvazeliwagev.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/gupalalezosizazasuwige.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/88590099140.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b7b4e3b8---66555118356.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b3060f0b---fatomuka.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/xifonanubita.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/67406648994.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/kanevusi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/39318335140.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xisozowofiru.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/potexamaxelikojonalu.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e6c8d0219b1a743d682c61ae53e93efd/99653532795.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/danezokexumaradijima.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/fabiwezimapawezagomaj.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/jepemipozabapive.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/danirivinufavekagajefile.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f808b207c46b8d849258ee8017d0473a/vujipudiriwu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160867b9caaea0---wigilup.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/jopositemofimaxipowa.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/zujojepo.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/xodisarum.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/kisuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+editor+for+openofficePDF 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_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 17664 bytes
SHA-256: 902eecc33dc8042a36aa45f28d9cbb9e76cd02821adf9071c12e9eecbf26fc42
font_02_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 10236 bytes
SHA-256: 386f2cb3ae19569853923cbd4a2cc749f093568b6d0a6a5cec9ec7ab42a6b651