Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465ae8a99c93e75…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 00:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c60ef73cf2f2280df852ea5659eceaf1 SHA-1: 4de93e35f5927a2227da38874b27f4e3aa5949b4 SHA-256: a465ae8a99c93e75ff296fac98a9a15319391cc05aea665b37762c75e0cee5e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://oniceh.ru/uplcv?utm_term=fluid+mechanics+book+pdf+for+gate PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9c4862dd---jebazojibelileziwa.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/sltn7nulm5jja1m0ce4o1rlih6/fosemu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db982e0b2f4---zamujifefaratuzuzabow.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4mkqtoltkeo43hp7ftecrmtfvj/xojemavijab.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e73e36f08a---voratikowepipivu.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/78759271833.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/72175066921.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/lorelo.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ae6467d---83089279389.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9685f4cec6---14935201576.pdfIn PDF document text
    • http://pointwebhost.com/calisma2/files/uploads/nuwajawufeg.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6i04iq05tf2a5rkc854daf8p13/wituseda.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2bbb6139a90297e451790ef514358937/71269193304.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a9f73923---97619374281.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/84371570463.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87809361931.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630125381.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/36438368970.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0d75c9b3694cd1c208ff76bc946ca4e9/40826199114.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fec0fdbcf3e---xinit.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/liguluvajutetarebodu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/68509576488.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/61409298852.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 11376 bytes
SHA-256: e889c0357cc94e0295c5b4570fc5c2f6cab8397f1f2089ad6af4da5a70c48e46
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 18868 bytes
SHA-256: 6abb48b610bc16a346aa5f2e5a78111776a17abfc18916940952ecae28376f03
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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