Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5c529cb3cb1e30…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 09:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 323ebe4bc36ab2784c6aeff1bfdf835e SHA-1: bf6e204b01080315fd02b432f63232dd2fa1559b SHA-256: df5c529cb3cb1e30368a32c4709999293dba4c931ba0c204b60210ca5a0ef4b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://www.w.radeton.cz/ckfinder/userfiles/files/wixodepafedukavelumonipes.pdf In PDF document text
    • https://noventa.cz/media/files/file/mokakat.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903234420.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613feaba9b9bc---18001355719.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/69778267233.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/loseradavujomelinegulotor.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210911_EF6083F0463763C3.pdfIn PDF document text
    • http://methese.com/upload/files/setivotofaraloxupenuxuz.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/65746741351.pdfIn PDF document text
    • https://xuongkhopbadinh.vn/images/files/tuzapejanofaroposemire.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/55186662472.pdfIn PDF document text
    • http://cssh.es/img/file/butejeji.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9b77a549---ladidepodamowomapavenak.pdfIn PDF document text
    • http://apsons.eu/files/file/lojemevomizivuji.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/55335220178.pdfIn PDF document text
    • http://dsagco.com/Upload/file/zogotuwasizimabadi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/733a1fd74a19dee759839221c5473754/53877009455.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/80207054809.pdfIn PDF document text
    • http://salwex.hu/file/45965528685.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/64915355784.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/52709077750.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/bujuperadenu.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/54388265292.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/78981670104.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/bavuk.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/gaxenolebebabego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=golf+battle+apk+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_off0000b8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B0 16092 bytes
SHA-256: 0fcb410b4742dde7c50b6e8f3936581edc5d188a04ab012e3ecefdfed0a8abc9
font_01_sfnt_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 10488 bytes
SHA-256: 51cfc59f7c35a6889d659d87ebc66edddb37f84f4bc67a87e0e2d485af0884d5
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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