Malicious PDF — malware analysis report

Static analysis result for SHA-256 c745d56df30eaf0e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-15 00:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 922ad876a5a201d83ca3fd82c8d81635 SHA-1: 4cb1512e7f18ee0f60097f879b50fbfa43d402ad SHA-256: c745d56df30eaf0ee37bdb170b08b1dc7cc8623dfca207b6d19b158b32d300b1
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=hitman+sniper+the+shadows PDF link annotation
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/51661935348.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/25235051451.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/84294332132.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/63109277177.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/senuvazinizaxilaga.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/wuxofizesilakefatuwop.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/1877170113.pdfIn PDF document text
    • http://hangquangauto.com/files/88866912113.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5ss7a3ourpteevpme6nnlkj1d7/31002428739.pdfIn PDF document text
    • http://lagrupacio.cat/file/pejiduxaxaxi.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/jexuzirubapulibot.pdfIn PDF document text
    • http://quetthe.com/upload/files/37569269007.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/favonubelu.pdfIn PDF document text
    • https://umutfm.com/resimler/files/fatenezovegonuwolawepiges.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9j0t0u3m9sb88cmnnc4lmmsisj/96838910353.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/loligabinitatawemafubuveb.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed9e6d612---sabog.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8683127f8---kesakoboredugukibenux.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/11312856326.pdfIn PDF document text
    • http://chamdure.com/DATA/files/wixitukuzo.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/63524140263.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf344c91a9---99067004558.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/jovebadinopasogu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7ee01fbd5ba236db2d70e0961951f7a1/zujinetimemot.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_off0000b8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 10688 bytes
SHA-256: 0633290fb13794615bd3301b410044b701fc78a1f7273bf5de159cf109a51d12
font_01_sfnt_off0000d146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 17480 bytes
SHA-256: aad322ffead502e73b7883aff191230367a63679aa3d605ad5e9fc748d9b764a
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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