Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d99ac25d56acd05…

MALICIOUS

PDF

100.0 KB Created: 2021-08-04 23:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d737b98b8d18943e63521362b9455de3 SHA-1: bd4c197c31d122535ee919f4852ba07794231878 SHA-256: 4d99ac25d56acd05324f11f7d6691d2d321720f1ab9bfb66621a2c9188bf60a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to create a large number of links for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=how+do+i+install+faceapp+pro+for+free PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c23dd060e07---kusofuxedonuwexovininiku.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/34027b40c71ecb680d2ffa1f68acfc72/3033050704.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/zobilizokitasive.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/36471922538.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e572a0036---rorojapu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916529938b9---kuwaronivapafiru.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/25722511022.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tixofatezijexirijoj.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8fd2de7b96a61ea3c0d11a5c9e7902b1/72711578141.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/45906018735.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8ab310e5---tajid.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/lepasixotixat.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/13021732290.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/natinosoruboxebotorapaz.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/219ne9bhfa0vodfqnbetochuu0/72314013914.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da7862614f---66440504865.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/16886047934.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vabaguloxixesasifomu.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f354c6200e---nuzezax.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/vitudaniwabija.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab80598e64---biputujifoxaj.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/kunupuv.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/86fb03a91656045fa6c149ceafaf2c3a/40301575738.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/xalaketexaxirixopikisame.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/bc3ac540bbcd647ce572f65371b55a9f/guxisonesufexovadov.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 10688 bytes
SHA-256: b485a4c243e47bd827e8e90fb94f2dc8bb3869784b62ea6d0e282a13b99fdfcb
font_02_sfnt_off00013b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B32 18128 bytes
SHA-256: 2820199050644e197702b7fa0ede2898744f10ac7d339026315dab7a53ff1f82
font_03_sfnt_off00016b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3C 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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