Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10f2770ceda8939…

MALICIOUS

PDF

94.5 KB Created: 2021-08-01 01:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e02812285a2600765f077ad59644f3b2 SHA-1: 8672a9f0ad64f635c49c5973016549259f9904d2 SHA-256: d10f2770ceda8939276141045513fb8a4397df3e1bbcc8c40f162ad3a4b9c4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The file's structure and the presence of multiple external links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://crysiq.ru/uplcv?utm_term=what+is+the+lesson+of+dr+jekyll+and+mr+hyde PDF link annotation
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921f3061dcd---45480859614.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/13730fd6926a617cb8792e36d414c590/35597471515.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b35a17e8b---9867913261.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lkg8n6ca74cfdm2fp9knlcmum5/78924181152.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/zizikejagib.pdfIn PDF document text
    • http://sushibelovo.ru/files/nuzedakerebetirenase.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ec26118d---12928601065.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/huchkdavealk46ivljeda2deg5/1489529023.pdfIn PDF document text
    • http://adveotec.com/img/file/41590575518.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/29489705043.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sinuwak.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0611e49e5e---vilofubep.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kelabowimon.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/vepovisaf.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/zakexanuxidup.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/14354425998.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718da485ad---99255693286.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b04d79892---suxamojawes.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607608bade2af---zunaboloweganoxexevej.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805939bec25---ribevetulefabuf.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6bdbee8fb35f557829b7789a6c92331/98589227960.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d8baa845e---gukawojovubarane.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0aa1884f873c8f7e31a890e67f0f3ecd/ludiwesapanovagatugebu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886e1fbe81d---63599713833.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/31643544550.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_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 10948 bytes
SHA-256: 973e7d85464ef85be6a1903cf7e81057e6ea7c7928720c2b84719e1a5818d617
font_01_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 18048 bytes
SHA-256: f21ac3df977eb22d915fe81a33010bf7e0fefdbe3059b14b0e769eb6263e8d42
font_02_sfnt_off00015181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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