Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f271e49f3b0afcd…

MALICIOUS

PDF

94.5 KB Created: 2021-09-12 07:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6a7478ca7c478c40443cf2d4a0afda4 SHA-1: 482772a68fbca4fb1a6b5d6a72e2eda23127949f SHA-256: 2f271e49f3b0afcd275dbd9b4565948ecc29ee7ff5066a68bcf7951bc474bb7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=watch+thor+123movies PDF link annotation
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca650d631---jotewigofolupeteteja.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/12596757528.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/57176975127.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/rixedikolikonos.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/98171996293.pdfIn PDF document text
    • http://yanartextil.com/firma/files/46404775144.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/44436042192.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/32819566801.pdfIn PDF document text
    • http://byecook.com/ckupload/files/86287874073.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/reperipikopokakuro.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/zuniluwuwudurelekodag.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/zipisadopugodebabade.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/92299604465.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/37812665120.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/taforegub.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2f565ea504dc3fbf04fe383bc9c464c7/jexasilif.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5e27eb66---vuvob.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/18913874913.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16569402912.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bekoxukaposamewuw.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/lejin.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/tuzogagokeperezadoj.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/23852400225.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/87576723894.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/63273027266.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_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10748 bytes
SHA-256: dbc3e5d8effe2035480b122b3f9769ebe11e718b565a772e77add003a8d32131
font_01_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13643 20556 bytes
SHA-256: fd4fb9aa64871574880ca0a0fb79dcbc8a68066e1dff0432ca3513e6e73d2120

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