Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5b2082bcb96a17…

MALICIOUS

PDF

69.7 KB Created: 2021-09-04 18:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ba0d592c5a0043fb9b63d7e5cf8be26 SHA-1: 5b556c30662b80ae7e9876fd6c64cb75d2f8c621 SHA-256: ba5b2082bcb96a177572a35d5cd0a18f971fdf672043a4bbbc957db094d2ea1d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://change-sexy.com/files/files/11627417871.pdf In PDF document text
    • https://silverwayshipping.com/userfiles/file/rijipunodadufozuxafum.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/latokagozegamu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/558fd85af5289c7d4c1e15e173a193a2/bojebekubi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/zikunixefuw.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ad1facb3b47a7d20bbffafbdfe173898/sijibabetufokunipovo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088f63ca85ce---fodojowapa.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/94741078717.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75949312771.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e64b1fc8d54---32070810155.pdfIn PDF document text
    • http://synfarm.com/upload/files/12787666600.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/lunubivilanixogoxaminote.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/jejejorig.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/fapujidizobuv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2b2856d54bcfa55a0cb8b4bab69f23ee/besugodezujen.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/nogikererej.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b2fd5e65---vutotovapuwope.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/9826378946.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893eb649e26---junejokafegolad.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lajodimip.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/q4iggh0gmg8shu9eccjcjig1j7/doxegafesitufemu.pdfIn PDF document text
    • http://akademibt.com/resimler/files/boranodikivafarut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=catalyst+in+chemistry+pdfPDF 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_off0000b431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB431 10912 bytes
SHA-256: a035e77caf49f552e43b4a6e6600e31f2ee7bd2dcedad68bd9a482f75a937f90
font_01_sfnt_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 14544 bytes
SHA-256: 1dbc145e8ad83408aba619d7afb9b8b5359f64851ae840d94d05a23073690445

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