Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ad50af748fef63…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 00:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c37057da1e150d9192a819fbf1764f7d SHA-1: 21bd954878dbe17d5cb6059918227e8dce9b14ac SHA-256: b8ad50af748fef63484de08cf2ecd81959e081c5f42a2804ba53676d8081b2dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://infrive.ru/uplcv?utm_term=alien+shooter+game+cheats PDF link annotation
    • http://pphjako.pl/userfiles/file/64523228683.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/64661408948.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dd391f49---tumenezipugiz.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109120323395071.pdfIn PDF document text
    • https://tavio.ru/files/file/namoxik.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wisupemeganutawozerexam.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/45163553255.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lufojinoburopeb.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbee1c8955---79910140451.pdfIn PDF document text
    • http://partnercable.hu/files/5585965122.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/tevojosokibebafejije.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/jowobusifaxaki.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/tunumel.pdfIn PDF document text
    • http://wwsm-us.com/files/file/tokimirogafakipimagadiv.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/13326095073.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/botalem.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/wabutijasedepaga.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/bozulegojekina.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/ziwipukorefeli.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/63962011025.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7750999da---82586133859.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131988114321---betol.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/7752807840.pdfIn PDF document text
    • https://maria-galland.ru/files/file/34874878050.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/dewukivoverifikeke.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/fefivokokowogok.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_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 10660 bytes
SHA-256: 3d2f28daa3c6de79b546d49deec6f634d0dfcdf1d8954dbab35331263830a1ba
font_01_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 19612 bytes
SHA-256: 3eaff954cc1f435328cd23c3712418f7bd261f1a84a33cf605c2a0c4f493e53a
font_02_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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