Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfa9083a7ac4941…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 00:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a96c9c760a639a7d2c4e94de92fe6237 SHA-1: 926b52002375922ce2b00ecd080363099dbfb6d1 SHA-256: edfa9083a7ac494173e48831c52310cded246c4c0ee4d5d489cf0482f9372479
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tribo.kz/userfiles/File/lagukexitaniginubisofifu.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/14387593606.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/xijaburerub.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/dibekoxujitewinifa.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/35576617400.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/sodudugodologav.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/neposidivabumib.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/28762093081.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/76876432858.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/fanetetukagipifolitoro.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/25526013698.pdfIn PDF document text
    • http://wami.cc/data/files/koxabamuxanaxevexeworabe.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a61ea9d501e103f2613641866314f790/61614962567.pdfIn PDF document text
    • http://anm-av.de/uploads/files/69415113028.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/79094636065.pdfIn PDF document text
    • http://www.moyekolodin.com/files/wozevuwitijugozigut.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/8927682426.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132009c27dc4---30650952980.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/murul.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/vulerimoverunavo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cff782280e---73333211688.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/fibupu.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/limuwubibimifovapam.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f10656e68---xurubesari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=me+before+you+book+pdf+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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 10656 bytes
SHA-256: fd66de519a58fcc46ed4cec522b0f4ff81997148cd10877513e03539ddc61ff3
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 17672 bytes
SHA-256: 02a875d48664486bfd327cc84c54b94afb2f9f3409f597719e74e7de2c1dbc1e
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1