Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0bdf9b94253394…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 13:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2137197e17a6074ce937bd8338e6f226 SHA-1: bdffcd225152b0edc77e76e919b583ea59f51ee3 SHA-256: 5e0bdf9b9425339469a629bb7047eb282cdd2d3e3b9b453fded74d3489b16c81
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary threat appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://taevlingar.se/images/pages/file/refodavanita.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hld6fe0vfrfs7l22ae0nl58gh7/71877121824.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/77e3efcc4d490f5a259e38d13e1800de/beregokiterazesuj.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/41197980634.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b39f687f0---91256726253.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/vonemuzid.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/0de70e01a2857121b107b9284d281fee/xuwafubuse.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1227e31822---6282715185.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ccbd7a593a9e298dacd0f10ce3ae3931/tegevebibit.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/86042721487.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/semuwozofapafesisuw.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e722f33c1---20415695915.pdfIn PDF document text
    • https://kaimano.it/file/79187171722.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/99911167695.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085829fc78de---93743748314.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0d6d9c5b---17122433344.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a00ea600---15358969378.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/kodozu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bdb23361fdb6dc353456e66193c5d0ab/199474288.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c387f5cd5678d49220fc75469a39e87/zenuxuxojix.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/18117270624.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///13618320679.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/65847310104.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1622937571888979120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=micropipetas+uso+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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 10556 bytes
SHA-256: c29ed08926b2c54ac84fb180097cf9a19e68a8ccd4ad1598e712fcf81c00d7e6
font_01_sfnt_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 20208 bytes
SHA-256: c079195933d4bfa5fd9759fe3456e9d2eddffb4eeb801e182cf425daabb65c84
font_02_sfnt_off00013b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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