Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c90e49ff6332413…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 06:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 566632e0850bc5bfd1e6dac2595b8c76 SHA-1: a9c703276c8477caff0cf55335ecb1be08d4372f SHA-256: 4c90e49ff633241334a0c23aac04c90fe333f6d0e7a542392267bda72f801622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f345dc23e0---37521185347.pdf In PDF document text
    • http://akvari-um.ru/userfiles/file/47764423243.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/mikekuzarenez.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/guxojikimigokijumilesupa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae1e91bbab---43701722906.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608817682cb35---lenamo.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210522104113703.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1db9b3a3---vitiputi.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/79536843733.pdfIn PDF document text
    • https://cet.sk/res/file/kapewerimuva.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/rekupoxewoxek.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/90276367965.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/77607080189.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/zanekokosiwerowedinejur.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/lerimivafulalufimometaso.pdfIn PDF document text
    • https://roc.mn/uploads/files/lovejorakafedupuji.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb53b12e3---87000710032.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/zilinow.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rakepot.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/81854551679.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/pejelem.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f291e24a38c---9713325157.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec4890904---gozigagabumeditixib.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2c9c4fb20d6e5edcca1d9384a7f655c/95776282753.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf884c7bd---kugamapibewup.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160de1fad16ff5---36767972355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+insert+tick+symbol+in+nitro+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_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 11044 bytes
SHA-256: 8fb81d807522cd4266c79a951e892046f0a9f350b882f998eec2ab3f9a00cab9
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 16984 bytes
SHA-256: d7b9246c100b01c390a4441d5e927b45de7c769399d07b613723b33ee7275d23

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