Malicious PDF — malware analysis report

Static analysis result for SHA-256 40743148ed780cf2…

MALICIOUS

PDF

95.6 KB Created: 2021-08-02 07:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96fbba5a9995fa931b548a8a5ed8ecf3 SHA-1: d9eb421b0d98e466cd819a69a6f9bb1624b7e014 SHA-256: 40743148ed780cf2e5b0560cdeae3e1115934164c71708361890157488ddf073
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable or compromised hosting domains, suggesting a link farm designed to distribute malicious files. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abwnickersonplaza.com/uploads/files/77008274149.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a2d65dd49eeaecd4341267df4c5d0227/lusavelurifepokugileviluw.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbffab895d---88018052228.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160992ce37149f---pizerekazewekiwasotupuv.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7987795fa8---jonix.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b240c7a4---wefotagufudajudero.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/53147966768.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/67962687844.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/neroneketexof.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/18eb89e429cc7520503374d965349740/4114535455.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0920fd2c179ede559e81b20062dfc470/duzugiwesogafelagukizibig.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fc24ac0e796faa221c49bcdc3c5914b/wozifokabekodapi.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/gebavosatukejovu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0acee6a7e1ef8d0462e51c4b0c84d52d/tazekabozukuzoxu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/229976c15c10ecc3fe5c59f3bb2cd351/xisinukerezuxetuwup.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/89tpa5j0gacujd49mtr4p5mps4/zerigulenog.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/74239296954.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/83122240890.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/uimf0a3ritpipbh9n8dhc97k48/gunesuzena.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/28887425646.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021430758193622.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8141c8af74---taruvovemadeserebat.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210721085308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=usmle+step+2+ck+first+aid+2019+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16560 bytes
SHA-256: 8d598fd92262a69f52cd534a3e898e9851c633027b615ee526ab181b8d6e0398
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 11120 bytes
SHA-256: 14a628b1a8b6223b162289b85c562a3d2e2ee369357c6c10c40ce79dfe3d4449
font_03_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 18616 bytes
SHA-256: c646e48ad4fcf18bbe51482f4c8096f491303366443e17178a4ab10f37074d93

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