Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2349a2be0a35ce4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 00:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 727a957da0a160fddf6f47957f5661ba SHA-1: 53c69231adb83f6aacc64e6232371dcccf1027a5 SHA-256: a2349a2be0a35ce4a0936cdc1b4fcdaf45597d043b5125b3a8e0401fa50ecf49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs are likely used to redirect victims to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/82503a1c11913e21eb40da5eac62d40f/jubazesonuleximor.pdf In PDF document text
    • http://euromarkcreations.com/new/fck_img/file/fofusojekasurodifavijig.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/25294662768.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/37884264980.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/15104180419.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/52315980134.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109131702305109.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/56242120585.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/61684693257.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/vk7u4NDd8aLX.pdfIn PDF document text
    • http://ahchala.com/img/file/tunefitokativaxem.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1564076c---77248670088.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/gabava.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/14303358564.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbede87cc2---27000931606.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/21230385965.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210907211633942333.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/10730881512.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16135529f1811b---95703808004.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/87918511765.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/13447949299.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/72642832315.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/niweroborimosafos.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a8a82b85---16526488869.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903083720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+data+manager+app+for+androidPDF 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_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 10848 bytes
SHA-256: bbc496bce5fba4b6d9a5b560349b76befb01289267ad961d0562c92f3a833c46
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 17084 bytes
SHA-256: a0d6a671bc0051787c0d0010989f3fe19ce35e7d3847c32ae95b303b92ac7ef0