Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a082a7f4d90d83…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 20:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ae83b9e26380aac28c554cffa8f536f SHA-1: aaabefa11495bf417423021088945f0d2eb19dbf SHA-256: b6a082a7f4d90d834bfbda197eeda2de1bedbe86d05a87ca44418b0e34293641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ktmcollege.org/public_html/userfiles/file/janonuno.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hgugorml1hrgk404v57fgfgtq7/jasozimidivudoxebojibez.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/5153136425.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c785f9c4f8---58224085503.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987bb6e1d4b---laxevaziz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rfvp9q080sdv3qr0cn7ptgn9aj/96427527653.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/77663072498.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0f11e439f1f9a5365d61ea3496a2ea40/35864625597.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/pakovuzofifusevobe.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a39361391f6a8c6c3a561407b1e606df/53470819594.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/rivapu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f5fc3511b24410a1eb8879f1f7319e17/miwaxolanisejoneramapelug.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ee1061a711d034c74afdc802e0b4a796/wasozubomofamawitododof.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/zunixofumelibugabojor.pdfIn PDF document text
    • https://tisuputih.com/contents//files/muwitox.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e3e5b2e6---wufojabo.pdfIn PDF document text
    • http://industra.sk/userfiles/file/445371951.pdfIn PDF document text
    • http://arslanemlak.com/E/file/73095713910.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0cfff100ae023050469140b91cc8838a/kesopulovomadexamebol.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/43568249035.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/71511967819.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/eb7d228b91ecfb148179e168b67077b0/54431988547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=como+convertir+jpg+a+pdf+en+un+solo+archivoPDF 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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 18432 bytes
SHA-256: 2dc41b5329b02a1703095932be1e4a3d788d5e914e7eacc2348a7a00cb0a8fd4
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 11396 bytes
SHA-256: 1b5da87cba424520aca6ed0ef69d2df202205bf531c079d285512d888f1de089

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