Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6ff0e95334db2f…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 20:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 765f3f1a6838c28c24a3fb81ea214d99 SHA-1: 2bbde7be94862bf613eae0a23b245c969d775891 SHA-256: 9b6ff0e95334db2ff877a5bb5112b93c0064a8e2fb45401148649e602b6981b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs and link farms pointing to compromised WordPress sites and other domains, suggesting its primary purpose is to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous links indicates a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=confidentiality+letter+for+employee
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c90efc8b4dab4b9d199ded1951e5527f/46661619996.pdf
    • http://sunarfactory.com/userfiles/files/8300512400.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb9a9535a---wojasot.pdf
    • http://alltechsro.cz/files/janel.pdf
    • http://appletechsolutions.com/userfiles/file/10746784403.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c214014f---201103454.pdf
    • http://teplospectr.ru/images/files/5377827539.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074ccb095fb5---gifovejusutotazekex.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607586fc3cb9c---kupobasid.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c055755e121---wotivuxamasajusofo.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/tomatarufigivonutuku.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d06c944d---54239652444.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaceeed52cf---pobowevawajozitopopoka.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/67d7ab6627e86a4ee8af9ba953403d35/93626593827.pdf
    • http://stellamaris.cz/userfiles/54691042684.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/m22v9ceri72piv2bvt1ggsamm3/gimixexelukedat.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/df48c8cb240bde0e2a2cb72606e388fb/86439575257.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073f58fa00ec---3590458788.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/tk7o10e1cajf9r9ubr4d6a4hrp/78865434981.pdf
    • http://crystal-lamp.ru/uploads/files/69401607316.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7ded1057e---gokibafafal.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/7mosgf0ftq0lsbu2d89ur3f9sc/naran.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48fed532f6---fafaluf.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/befa5a9c2a81bd477299f7fca6744150/perogaku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc0.bin
105e79aeb41c58af625af34110824dcfd8a1e7361494c4a0fa9f8af6f68b375d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 17284 bytes
font_01_sfnt_off00011aa8.bin
1ffc530b022eb50efc71a3001cbf6228bf8a1615ab58d48ad2485e0d9212d48e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 10636 bytes
font_02_sfnt_off000132ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 16792 bytes