Malicious PDF — malware analysis report

Static analysis result for SHA-256 4421e21ca587029c…

MALICIOUS

PDF

113.3 KB Created: 2021-07-14 10:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 944663f5c69c674b14a7f48886f620a8 SHA-1: 6adee5f11c184ec09e8632857e30b617acdd6984 SHA-256: 4421e21ca587029c23cef85bcb5bec0a15a848fe191c1af417fac3633aa36a08
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves directing users to external malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://curry-box-deluxe.de/userfiles/file/foxevopudege.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0ovk1fklqorv1sunc7dirdqn0g/90337612616.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/16540162680.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589a0ace42---74564734017.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ojssnosp6q2rkl7o55hmft2rc0/64457163528.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8mdmi86m7o0u8jqk8i8hbv91f5/78634875346.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9c3981cd6ad3eb4cdefcbac9cfb62dc8/jipujo.pdfIn PDF document text
    • https://susta.vn/userfiles/file/nubatipurumazuguke.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e535bf84c---pebapunuz.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/219573374528eca7ae0da7b7d94d72ac/5907415154.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/8597380172.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ba3b0a06---5312685350.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/40360940251.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/004ed5098ba976f3fe878341a9cd0aa2/16205429270.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/logofagajamez.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/sepibisipubavididapog.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6871063e1d7aaef9a02caee29eb15fc2/78690749561.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/81641d6803f84849e5bacb9a673f4934/vojusaxanafog.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/67159528709.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/50811075263.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0153863d9efdad0021987572f4521917/81482473560.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/luvanisifode.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sinatejek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=instant+tax+write+off+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17398 17136 bytes
SHA-256: fbd920496fa609e6e9c9284f80876669933ea8367e3ff48ae3eba5cd59de088d
font_02_sfnt_off00019f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F81 10652 bytes
SHA-256: 795b7b79807b34f1a10c2bd2b27bb9afac5c6ac698095085f4b749f278cce8de

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