Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b529c814539312e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 08:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e29cad1c677ff3e6a3c6a02cf7c99e9 SHA-1: 9b67307a03466b5fd279c1e87532a6ddc9821728 SHA-256: 1b529c814539312e1c05d78b2c1416db3d4e04c006c0cd6915138e6ba995ca3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting. This structure strongly suggests a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://profesniprukaz.cz/ckfinder/userfiles/files/40216729681.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7be0052170---85049728244.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ce983eaf0690e686fc47170b3d56d927/17500882560.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27e6696090---wakifimolekiz.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/fuwali.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109021217589149.pdfIn PDF document text
    • http://hmed.vn/upload/files/50110002247.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/6983554089.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ed84af7763530329966bd96a48971a15/matuke.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/70018002553.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/wobegeluvo.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/wepokevepujaluwave.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/dokevepafa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d129190081---37396267698.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab30ed6f0---23272068476.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65146728946.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/sibokolapomupal.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b5984bba3827bb7a7456894c4f6f8936/lobekexuwif.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/kebekividepagupavalamopu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/kizijalubum.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969d87e4a44---gaxofuwo.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/14933273450.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/24237691266.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bba8489c4ed---3400009684.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e90474d05---jopesipezadeboloraduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ted+2+scriptPDF 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_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 17216 bytes
SHA-256: 5fb0bb82b7e36aaa67281b377f95e9d53869d0f84539910b7eb91b5dce835c7f
font_01_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10160 bytes
SHA-256: 287f36f87f4ccc0c828f4768a6f3ae657576fc7210dfd084fae2fdf8c64799f3

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