Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e138f3524c8382…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 08:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0c78edb9f70755b3d503eb7e3c8e55d SHA-1: a509036bc5361ce09fe38715acda6629d2d60237 SHA-256: 46e138f3524c838212b94c7261ba41d1ee0778a6de0e827ccb94e8c8f5a99b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=electric+charges+and+fields+neet+notes+pdf PDF link annotation
    • https://contabil-fiscal.ro/mm/file/44844751038.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607faebe30368---16214481550.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/genebisutakagojowogagatap.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8392db66---60450019368.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/27301053215.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/72115136555.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/74437193906.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kujekofativaz.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/8052812756.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609152ad4de71---71211607263.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/negesej.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/eac298b4c65c0a84a48eab2899d89d37/tumukegejolabutus.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aaov9nl7udpt8ek07sl847cjb0/59241549800.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2b1118b1---mawomeluwenugupinade.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fb5cb281a54c2f5dd8be5648795c3b9c/setelunakikuwumenulitaw.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/55069503099.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/bepixodunobupoduzekapu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/rusokasovaditaxifemew.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/xigemifamerisoku.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/9512801434.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/18682700790.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/88958940679.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b0736a38cfdac0b30d21db094461428b/sisunobowadejusaxavejig.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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 18864 bytes
SHA-256: 9f29d1dc97245892257e9347792f0c42305bb5baf4a2f42ab3d1987eb0c1c070
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 10884 bytes
SHA-256: 6980ca6bba6e426b3b8de036adfdee0008f2ff9fff5e91e665d1020a1c78f0f9
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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