Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a9aa8adca16575…

MALICIOUS

PDF

86.0 KB Created: 2021-08-13 15:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8ab624a3923d63148a74a4f259c151d SHA-1: 99b94fa75a1b899d70b60a59b92a733c9817da36 SHA-256: c9a9aa8adca16575fd631f9f802b0cc99b100049860ef656ee3c1d0af0289557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ajoh16ualgkpl9bae3r5nk588g/56998063740.pdf In PDF document text
    • https://topclassgreenery.nl/images/file/57535618081.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/kezelagupirez.pdfIn PDF document text
    • http://domplus.su/userfiles/files/25026995160.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jopesafuwe.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/gevagizujoguwinujulogigin.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/35189203668.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160841befa3f9f---30499760348.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/70776427498.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d9c927dbf458ce1bb6a31cc8bda8b014/79975043928.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/96084685862.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a830164d763---78484459420.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/24947538881.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zidedafesidotajujoketef.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/beganibizitenifufan.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d87f856f0---luguragederunarutabixowek.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a1ed0636b66590c3783b4342476c6f0d/dotuboxomapasa.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051210102416.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/10091722049.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/tixuvobamuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd4faedf9---mamozesudunene.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/kobajadatozezidesugode.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1f309fc59e17a10fb0716c0aa966f114/56634152832.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/kaxelimogalafudobutixewox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vishwaroopam+telugu+full+movie+downloadPDF 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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 11164 bytes
SHA-256: cbcbcfe01888e9cb68e7d6204c3d1b6d747bb56893e4bb3faf8270fff423380c
font_02_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 17364 bytes
SHA-256: 4b9aedaa110591cb13d812fdda91a5fe36d20b40caa653765c021ea34d786485