Malicious PDF — malware analysis report

Static analysis result for SHA-256 560aa9397b356bc5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 20:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae9cc0ffcb62160de1086b356106e0a1 SHA-1: 0eb4a265aa8f6097cef9111e2f929a3e1c1ea003 SHA-256: 560aa9397b356bc5d270825597d2ae0620af557838fe895cdb45294951030e86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=atomic+size+chart PDF link annotation
    • http://uteambio.com/upload/files/84727122621.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49cc68d81---59356029379.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8940dee2437a2a593005bdfb9f9ceb1a/nabebutiporepizilemiduxin.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/9324529759.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/54529040206.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/sesotixibiputukijepililid.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/kuzajupoved.pdfIn PDF document text
    • http://htcable.cn/d/files/fexixebodevi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/tk0kn35b6nbkks470thm3adqh1/12554102505.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/79709587798.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/13294300788.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/mesejetubidutezedinubi.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rujumu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/bivid.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb876971a6---95791365071.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/sinefexutabimimisok.pdfIn PDF document text
    • http://planetamama.ru/files/file/33352786858.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/bupiladewibi.pdfIn PDF document text
    • http://xycrusher.com/d/files/gedawivozupobuwokokes.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/22779953832.pdfIn PDF document text
    • https://mmtours.si/uploads/66247749541.pdfIn PDF document text
    • http://actinq.nl/upload/file/vogedanelifefovejed.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/56953465257.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130446b33d10---fuzajiduborelumuvobifug.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/96637142998.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 10388 bytes
SHA-256: f82d8d0792d0286fe7704f94ff56f608a2269ff4ad814aa2049e1e39cd69e738
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 17864 bytes
SHA-256: 15e08650b188f4dfb87bf566081ab017777abf437d343f051f547b8fb657ab5a

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