Malicious PDF — malware analysis report

Static analysis result for SHA-256 88efb9f7bab1aade…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 12:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d323dd5e1606fafcf7881fa8b81f110d SHA-1: 3b3d4f10df277c57e58f1472c7bcde767789baa5 SHA-256: 88efb9f7bab1aade97b18e79af46eb5b432a1041f103cef3bfe1579bd8f36eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=ration+card+bihar+form+pdf PDF link annotation
    • http://permanentnimakeup-brno.cz/userfiles/files/dexobafimivezebogukefuz.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/xiwezobesesivikebisam.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/kepebusuwavijafapu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df59cee23---timadumosolasivukijegabu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/54609579599.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/2fd13gm84gqr162f6s0v88gn10/36953849718.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7aa734774881e8edda67e3d04eb3f715/gugej.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/49655694883.pdfIn PDF document text
    • http://futboltotal.net/images/files/8079897975.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/nenuvadoteko.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0ecd0d6c65fce9b688d8a8802bc43be7/35868683978.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f93a0c91e---30874409692.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621078130.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a93d48b34299c02f57977ff006f33a23/zebabolumunuveredid.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd823571fb7---29395354819.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b70673ea---89492596312.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8e40c0e5---61951374458.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/55056901293.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/lafuloluveraweku.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/735554252.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f47338552c1404340cc3db2e7b1edaad/21635217116.pdfIn PDF document text
    • 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_off0000bba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 10724 bytes
SHA-256: 9980d2ac29553113594ce66205b4c0590da8528740a28673e8e7df19873f7860
font_02_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 17440 bytes
SHA-256: 228e38695b22620f9fab7bcd34a90eb113f071cb250fe7c44d0d59485bb2fdb4

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