Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ca64220615cd11…

MALICIOUS

PDF

93.6 KB Created: 2021-08-12 21:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd866528014c19af73a4a2c19a4dafa8 SHA-1: 31a870f6ccab0d3f6064665b76f8d5bc91de17c4 SHA-256: 84ca64220615cd11f1331c0f3b02e956077cf6dc0e61aff9b932e1011994835a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to lure users to potentially malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/38d56e3f2549e1faee06686c0fc48821/kiwabowarunumado.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ace396373fb9fc8bb84a17097beceefd/3620808859.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/penizuvipafegalofok.pdfIn PDF document text
    • http://daydala.com/userfiles/file/xovumilitiveluta.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/57076859971.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/rezamuxelodobezidavo.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/lovaja.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/31736903515.pdfIn PDF document text
    • http://german-ex.com/gasotu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210722185318.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/66010518950.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7c465855bcda1d0340959a0717ae567a/lefev.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8a5eb2eca823938190df0bb9207196d7/51862592077.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80cbe6a34d---54904081140.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/84069806084.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad382bb9994---weguresuserijozuxefupote.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/24677338026.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/9d6029674a5999eed761e726100ae432/83380880158.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f772b7e54c1---tesulixejive.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bff45d09a---zemakifubimeninomevi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f221426640---jamapabunomirapeme.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607671b8abbd6---31451876373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=euro+truck+simulator+2+ukraine+mods+download+steamPDF 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_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 17212 bytes
SHA-256: 09ad61f232ef209399495226195946b252b40039a8e7cbe805878d0bcc2417a8
font_01_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 10912 bytes
SHA-256: 0722eb11a5674c9d5a33ed434517b69b406da3383a6c5ab83efc467dc0a5953b

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