Malicious PDF — malware analysis report

Static analysis result for SHA-256 097e8a2b2a25a593…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 19:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 17297e9f8c66d701bf0a4dd12aa47eb2 SHA-1: af1c196964c36cf55d26e3da756f43e3a6bef306 SHA-256: 097e8a2b2a25a593fc51df2c7a9a4d56805fe19319e14434d61ce20605ecdb82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself is designed to lure users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sabresources.com/FCKuploads/file/79839429211.pdf In PDF document text
    • https://gilbertems.com/videos/file/vujikefabuvopazefalosidis.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/tegiluwor.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614111bb9c995---57413080462.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/motexu.pdfIn PDF document text
    • https://tarsiman.ee/files/file/bexabibitepe.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/molerexodexatatubalaja.pdfIn PDF document text
    • http://autovoda.ru/upload/files/77139387144.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/23222290013.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/85607209590.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/lekijoxes.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/35575920481.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/munusokebefusaremotonemu.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/gonus.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/gapapuzebalevukisuxedekat.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/volivataxenebarigudaka.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/44891640953.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/80283713207.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/17794447789.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/24074284131.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ul38shfn1guaojvru34p87ovs7/doxaninirivepiwilobune.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/viwisozu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/988bfb39eeaeea85b1281debbd082109/62821061190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=juasapp+prank+callsPDF 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_off0000b406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB406 10108 bytes
SHA-256: 1909896ab1ae582b65e9cee4266cee119bdcff598a5777451e7aca9f4e692d0c
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 15908 bytes
SHA-256: c0cc11b6aaafa8ecc8a38bdd167b01eb6af6a4931ca53534fa290f9605629ca0