Malicious PDF — malware analysis report

Static analysis result for SHA-256 f498c148dd5d2cf4…

MALICIOUS

PDF

76.5 KB Created: 2021-08-14 07:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f19d1ec91f96ee81e3b8239a6919037 SHA-1: 8a903113e8b21c149f059294b6ef241ab3849d47 SHA-256: f498c148dd5d2cf423670b02b31594166969077304426c2b7d1bdaef4a6690e9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=expresate+2+online+textbook+pdf PDF link annotation
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609af0439deed---52065219431.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/99098181988.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe00eaf8e---59751051013.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160908bf26dcb6---nirepexuzivisik.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/zabitoduzegusujavagaza.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/80759332364.pdfIn PDF document text
    • https://luminex.pl/upload/file/barifituwopodunafipujis.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f703051126a---temixagifi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/da2a22160285cef8e181490004d4290a/24688855658.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ac6f3c45be6445a15a28c1a145ab0a91/48669767728.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/suresasegi.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/woruzoloremafovabuwutezit.pdfIn PDF document text
    • http://ha-sine.com/d/files/tedelituxavuzedirozixe.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2094c9608---20421531363.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/au1mgblhdbsv5bcs0lflpbg9f1/58419750929.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/42310466225.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b37983a491e526c6a72e52415d271c10/74104056019.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/rurabosuvujevovoz.pdfIn PDF document text
    • http://acril.ru/ufiles/files/66005889868.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b318dde0e---sakeremajax.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/87866027960.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/zojolis.pdfIn PDF document text
    • http://my.hrw.com/In 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_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 10928 bytes
SHA-256: ccf9664f7f3ba7c9c27bd6f5422f80d77b0825672ce59945d6af2285d778f508
font_01_sfnt_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 16668 bytes
SHA-256: 7b31325ade30b16daa47b89194ce7a70d24697a913b4c5da3feffa94984eb9d4

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