Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cfd21889918926…

MALICIOUS

PDF

104.9 KB Created: 2021-09-02 11:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f26013986c214d7507e8d85a3503ed43 SHA-1: 9bb76b28df1dc287a73bfb4c5f6c3cbd9b3fcdb3 SHA-256: d6cfd218899189263b290ba6bfa4cedc455276f8f3d0e534ed381f7082ed6376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16f111488---vepuwudikomiponegemef.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4k2fu50e307snugqm1t70vce11/xugevosad.pdfIn PDF document text
    • http://jarosi.hu/files/file/kikav.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4c40ecaa837467e3c5e10055fa53852c/50848597593.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/razipubolij.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e695e4997fe3e7e79335dcefa186d3a6/fewemonipuxij.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/fetewovetumexot.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202987d00c---pevolubevajevaxa.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/20964974088.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bosewuzajemoxopuniwedo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb35c30eb8---85279509861.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hvo59kqs0q0c1c75v6j278nt74/28579252228.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/52664922804.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079910430445---wimuzoni.pdfIn PDF document text
    • https://grouptm2.com/contents//files/33515200360.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f2031e80c6d778f70250ba0c4da914b0/92740633833.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/jajutejisixamuwix.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/rokixa.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/xigawe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20208439455.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a534dbcba3c---91161226567.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074907add088---8551933901.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57140190874.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af628195843---57314265716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=miko%C5%82ajek+wakacje+pdfPDF 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_off000132a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 10468 bytes
SHA-256: a825bc551ef01525d688e300516c5498dcedde20ab081b5cfec255b5b8482e41
font_01_sfnt_off00014a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A96 19844 bytes
SHA-256: 88286ea409cc05152e374e012739eee9830112873927cfb21c010a92d9106944
font_02_sfnt_off00017c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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