Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bf6903949defc7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 12:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 824e5f4a0f91ec21f7ffd627ae63d224 SHA-1: 96ae6599f52d7a2c8a323665508781d359ab24aa SHA-256: 83bf6903949defc71b5c7b8226f23a3401544bc3f982d97a49affeeca3b4a99e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's part of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://coretry.ru/uplcv?utm_term=aesthetic+symbols+for+instagram+bio PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190ac8c2dc---18503691137.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396a1a06bd9---65135952775.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/vowededenitusotitu.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/wobuguni.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/ledatufeledajapinuduk.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/61247082523.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/pokejadovefotof.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/wosexozivegagifenukuzo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/12219920659.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-04/images/files/tokesadolatafuvixozukax.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486c84ace30---zudizewufagi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e42f18f68---68861728381.pdfIn PDF document text
    • http://asustainable.com/global/file/49908937458.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/guxukiwigasosumaviwi.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/wudedokemujatixotusiju.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/724950332.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/80158170609.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/69657200286.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/23214037057.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/4455058047.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/47881165904.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/49660160655.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f479osrd09jso7651jb4m9tope/xijuzibitamokewoj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 1732 bytes
SHA-256: cc9aa9d10d6f336345dda96c648cf1cebe6fdaa1cf59576acfec5bb48f04b3bd
font_01_sfnt_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 11016 bytes
SHA-256: 209c0f5763d84f7e42ef807ab1141d5418151e1912743237a1c85b1a3f66816c
font_03_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 23744 bytes
SHA-256: 5c56980809f30372a2ea564f011a23904261be2e363a8ded9b951ef130c83d47

Open this report in the interactive analyzer, or submit your own file for analysis.