Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82d5d6c90c186a8…

MALICIOUS

PDF

128.2 KB Created: 2021-07-13 18:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 639a67f43b09aa7685f2a0f83bec8035 SHA-1: 3e4242f187e4a5de624e4418f7e38af72bfa1ba4 SHA-256: d82d5d6c90c186a85eedc5d63d77e53ff8c991d7adcd5c5e7d702c6ddc5529a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to compromised websites, many of which are hosted on WordPress installations and utilize formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points to a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=primary+aphasia+definition PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e7e63550---77849489762.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/telesi.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/84873447685.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f1aad5f8c---98341316033.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/df6b58b814d6779eb6753f1ed514ec91/67025727444.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b238ad0224---81247980764.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac82c672d4e---57431995615.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52061403b---63250732093.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/71601182292.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/gh9k370d8lbdqq4ik4gs5erft8/bowexutujefibuxinuwubupo.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210607073716.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/resugibi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gtus7vldas8pngr09ulqeb84et/46098608212.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/39019783866.pdfIn PDF document text
    • https://yellowstonewildlife.com/99416033578.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/kefuzegumameworelugar.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbd000ba1b---vetakerilofo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/nixowelagak.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7f21fe71---10680830424.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6255a7f692---18045825786.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/gimawanuzojibuvajuxipaxo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c797055ba7d---34653076187.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_off000190b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B6 18412 bytes
SHA-256: 30394fcf863f166f31c53525f5a5411473e1290bc79c273d90982a87c796dad9
font_01_sfnt_off0001c0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8E9 10832 bytes
SHA-256: a196a1d49f573ba51b9e885e7df2432eaaba8b253a4f579080538a6dcd51e19e

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