Malicious PDF — malware analysis report

Static analysis result for SHA-256 d743405027c4d65c…

MALICIOUS

PDF

110.5 KB Created: 2021-06-26 06:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: daee972c9b44c18a848451851f976d7d SHA-1: 958a9050c3145365a48060b9cae080c4924b41c2 SHA-256: d743405027c4d65c5321beaf483c30e19f5525fea671812cc1e1ecfe76282ec8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/5abcf7be6b0b8b4b47d86cb939f36b5f/kegafi.pdf In PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/66958761246.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a6c5819eed8534f61be75326991aaf7f/39878532062.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c0be3ddcc10be646c0d594c71e3bc195/xanujeguviwolasemav.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/k2kb9umghdifnrgftcrpahopbd/zanivikunokagazamaja.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/60bb920a89d8a310884efd9496bd32d6/videwimop.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160988aa364271---leduz.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca95a6b14b---89738080829.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e511e6052---88928439089.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6177d1e160e52f135f1a876d4a4cb5bc/watavuguvitowofavidup.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608541d17a369---51875468584.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2f7ec33127d9a7483818513682d64f5c/sepakugex.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/ragivivit.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/pusozugazewenad.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/63242066755.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63a22fc99---wuwozataxixa.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n6u0k9f0jdgvcvveu0s38np4iq/79492118751.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b72fc3e8fa8---fumagifusigusonamode.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/52966781294.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e86463ca0---konuzolesiwifodojapavi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16cacd70e---pujilis.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/nitagaxanawigojipi.pdfIn PDF document text
    • http://tcihk.com/userfiles/dizupewo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec4f6d403e---rorofoguwag.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/87322939338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+incredible+in+englishPDF 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
stream_006_off00017994.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17994 24948 bytes
SHA-256: e5b69105dfe8c6402b106b7c92327d37fa89042a277d82c00aabf174defecfb3
font_00_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 27384 bytes
SHA-256: 617bd177ed7ec574e74f0c153ab5fa196f26f8b77c7a5156948adf114f622952
font_01_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 4364 bytes
SHA-256: bf66e5e1de648316ca98c802bf55a0328d35e805fc31c6fc93a4f91a28949ddc
font_02_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 10788 bytes
SHA-256: 9202dc26894da106a24dc42b82cd1e22444a5df8432d34c3685cba23aa2dd235
font_03_sfnt_off00016183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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