Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbde37dfa4d73288…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 12:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 333008d7829db1c9f70eedf6a356a832 SHA-1: 4ec211d41eb1f4c3323618edd0f33cda175d9cd7 SHA-256: bbde37dfa4d73288ea276d9479e8e0e9e2f42e8eaf3b7f9ec4dd1e3f432e49a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=top+10+bollywood+movies+download+sites PDF link annotation
    • http://rcmo.ru/upload/files/87869056856.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/98279321939.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/fojamojo.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109101807242254.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/fixep.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8e100a99cc9df549006d67e4d5976ec6/devosolapubupefupegi.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904040659.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/2409752753.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sejuvulanewubifojorumosi.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/fikime.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdd6c2d32---99188566070.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/kafumik.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/vovopolozawosedinatareni.pdfIn PDF document text
    • http://sergeybazarov.ru/file/80672776446.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/jerikolane.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/fuvivubapiminiridoli.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6ffd48bd---78348580440.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/pozer.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/9425287068.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/54786473317.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/dixepanirim.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/vumuborewedebigineko.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/11857514024.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_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 10996 bytes
SHA-256: 719299e7d13acd94de2c53b2cbf1893cea21a555bdd42ea37d2c8def668d1742
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 17348 bytes
SHA-256: 4460d310d06bb22a5698da534ae9e791bafe6a9ec22e33e111f1e305567f11cd