Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce3a8de613c8087…

MALICIOUS

PDF

93.4 KB Created: 2021-06-30 22:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6964d297e11e9ce41ba663e9f2c32c5 SHA-1: 39bf6ccae703ceead2b795dd05c9e94e1043bbe4 SHA-256: 9ce3a8de613c8087d04bb63534e3800cb4a3b0fd2a28d1670cc872c6790bb3bc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://alibabaoman.com/basefile/alibabaomancom/files/xosekurawuxebufase.pdf In PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/qlf90m4vcfq7lqvlqgk2haqlhr/timolonot.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sowobagoguduvus.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/27913211356.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/56950210707.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vakatisosafexulasew.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccabd0593---28340476860.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/gixulej.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62884059729.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0799222d---bivukuzifuz.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609121f193adf---76573815746.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4a2ac063---28572503587.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/vibolatiwo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/wajunafepap.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080130e4e4cc---namogosesenatezunosodobi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f23196517---fanepopidesimitamozuwa.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a608478bd90---nuvuxafamexolebekevizo.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/lenidabomijibewujuv.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cjr7u7380fnd75pgronrlbl75i/34447439427.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/96226303866.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f0c5d4e---10559579889.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/55888181838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+courses+to+studyPDF 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_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 18008 bytes
SHA-256: 30fb9a9d8f62de6b8ae3026242a22cfdb0722215e3450deb92120d1c0afbe26e
font_02_sfnt_off0001528d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528D 10228 bytes
SHA-256: f0ae0abf1331464675cdcdfb97f9407cb5728e9b37de9785c8cecd4a2b8f10c2

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