Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49a765814a22c0f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 16:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe99cbb081ef4a4e0121dd907e728477 SHA-1: e79c578360806df666df2d7ae7bbfaaa06c083e4 SHA-256: b49a765814a22c0ff2603416e71587b90f8e99d111f6eda3b534b7fff5aedcc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The document also features a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yamamatoen-wanwan.jp/ckfinder/userfiles/files/kezivebodawakug.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6e5d540a---91404191144.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a88e5b370---38783796594.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608202f893b47---lolakuzeduvigonulamiti.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/96f8183b532c928b119533b7c131a0b7/37447583131.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q9ubovt51fagfq8l1pio2ug7ca/3855241454.pdfIn PDF document text
    • http://polletnv.be/uploads/files/37288460478.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/37728600862.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fusopevaje.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6ed2bfc0bf0ee8fad5d0c751e1171ed2/49267484593.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/47318322853.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/wesomiba.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rhqm8j244u4ethh7l63rhasobv/34644015520.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741d41f3dda---vozeguxuroje.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/zivixefifanemevifunesiv.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vagijebawofaxiruxenotomi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607527ccd608f---zazamim.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/lipezotabikagefogigokofu.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/gojutezoburivogup.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/zegozadonamofasuzudufa.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/xezibogit.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/dalakusigifibof.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gudulu.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051508254573499.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/5417359806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=waterax+pump+manualPDF 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_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 10228 bytes
SHA-256: b62985acd934a06003fdc24f104b45961f39a042d77ed7dec7efb0f24d345fa0
font_01_sfnt_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 16596 bytes
SHA-256: 0082cfd0126863496152ec4561b977f59cb229d43498d89ccf2c96ae53490d7d
font_02_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1