Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f62d5e122682da…

MALICIOUS

PDF

93.2 KB Created: 2021-08-27 19:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee11c4913ae7312929bfbb6a7d1717e2 SHA-1: 28c3a117fc54c62a8a112b910baa91c62d9c397d SHA-256: 98f62d5e122682dae695ba1a48e6dfbfc974e0d07989de629875db354afb8542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16093caae99aad---zijumatalelof.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/85611a5fbd9f96ae2cf3d20b4a890495/sejufokowurizezabatuwiger.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/35553272329.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/15960706701.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jewuvaxugoxesi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/42139224796.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22451239770.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/15652186905.pdfIn PDF document text
    • https://anjingliar.com/contents//files/63330562565.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lalaveniwipufudexowum.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/nekobuneganol.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff27912c55---laputudiful.pdfIn PDF document text
    • http://teknis.it/userfiles/files/40730757989.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/feguwutetezunizudakuni.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc7547d04---luxovagetufadogefutevut.pdfIn PDF document text
    • http://yoron.net/up/files/98732946389.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ac4620bbe5b152b304c629c844704daf/98191568694.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a256ac7ac---dasedulapigogizoj.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69328003445.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/070248008327.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e391f412d56---19166474880.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/megipajifijagigalumo.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/tojorizebenirupagimexuf.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c338dab7b4d---13344715433.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a574ed23b0ac227ce822b12027f85422/37117240961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=little+boy+blue+and+the+man+on+the+moon+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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10736 bytes
SHA-256: 766caa729b9cf4989d09e38aad24efe9f6da0e4fa169cfd23b01cddeeb51264b
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 23776 bytes
SHA-256: 7e67021c9baa8757b67eab726f5b8b5612092a9e083bcd06533ccc58688ab8f4
font_02_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 2128 bytes
SHA-256: ea0838c56c771baac3e7294113a37a869da30c0923c5234740d3ad99157bc88d
font_03_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D10 16908 bytes
SHA-256: b16864005b67fecb04e4df02d417de282480800183a93201b7c091d7fb1afe69

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