Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a8a7d732056a23…

MALICIOUS

PDF

72.6 KB Created: 2021-08-27 18:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 26b16d79b346eb6310d82515880659e5 SHA-1: 372308f0e95f56bf78228a577899914d2a90305a SHA-256: 37a8a7d732056a23baeecb33fc6fc41d28e580d3fe91d961156440ac231f4347
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 0.9973

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://wastran.ru/uplcv?utm_term=the+bible+on+idolatry PDF link annotation
    • https://drivetripper.com/userfiles2020/files/belejif.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/31771689883.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bc770c971eef3801ac0c4328d79eeb27/milabo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97abb91d5---mosinonipilofadujuxowazi.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/xemoxejewu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa2dfa2840c---leligefifusudogupad.pdfIn PDF document text
    • https://epiphanych.com/images/file/kovidibenakadavegodubonon.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/33597470801.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bf8729b4488be390f18445f9466f56fd/79348506478.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4c2573f1---robumisazixukolikasob.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rd4fdqak709hpighsj38i1dcem/tovitumobum.pdfIn PDF document text
    • https://ikima.fr/uploads/file/47084319077.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/4203916370.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/xepitar.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/kekulerakubimixeli.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-24/20210524212128775664.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/71d75bc8b1d5ae876760e14cca4e0306/nawinikanule.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/fajen.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/3144687173.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/54817733667.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720b9bd451f---serufajisufifuvowonomu.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/9580308051.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_off0000bd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD40 15732 bytes
SHA-256: 6cf5962964949eda6829a25a82b6277a90f6e7070731d6030d7b0b4f009d281b
font_01_sfnt_off0000e5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 10392 bytes
SHA-256: 20cbe2840971d955137419fc4fc0c16e94259bcce3d2e8bb4adc14bd06b2ea80