Malicious PDF — malware analysis report

Static analysis result for SHA-256 996a09c5fa280828…

MALICIOUS

PDF

80.2 KB Created: 2021-07-07 10:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 219ab25c9c45c77b5a6a47899050cdfb SHA-1: 2149d58e2dad2b25dc272b96cbde0574028f1ea5 SHA-256: 996a09c5fa28082850f735f5a8c308a68a8a04650223d834c462edc133273c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ls47pbtlgnapitv6odcotn5qct/zamivagamojitis.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7841ad3e---35154984178.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/xalarijifegux.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/57531349579.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/jupeze.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e4b9af1c---sisolawixozikuzelizimosur.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/tegiz.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77095fbd0---fidibarositubulosini.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970a153169f---poxitusilovonasoxize.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///wodixel.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fcf29b34---zuvusikotoxojodas.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d242364953---92757141181.pdfIn PDF document text
    • http://beateromer.com/bilder/file/61648977310.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8699ce8272---70577738546.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a984a973e09---32750272727.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6ad5c25b---50038897471.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/89982447134.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/20389529810.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/31306839752.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ff99e9fe02feb5c01b8aa83e61322e84/pened.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f8b828a08edff0a99fbfc92e51e91697/kifital.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tebodipon.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/ximerev.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/63535692341.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ec8414fe---79169137714.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ab1062908d748e0e982bde6a5202a6b2/segegofalofedezako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=convert+word+to+pdf+and+merge+filesPDF 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_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 16880 bytes
SHA-256: e26136c2b7acda880d682d7b94d1c1e2440991849448de44aa11b603840bb8b4
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 11024 bytes
SHA-256: 3111677df3131969c550a2a5886ed3784f4a050f8aa1192c88b2a9bf07c84b35