Malicious PDF — malware analysis report

Static analysis result for SHA-256 907c23229d35e65f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 02:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f4f1aa42ad2fd6b0e1c50a58d3c5f33 SHA-1: 8769e468decf8d2a8fbf3bb298a47a33a258da3d SHA-256: 907c23229d35e65f33b00228c5961b01f0ddc473e1c8a1b44e19a7bff52118bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pomodorolennep.de/gfx/userfiles/files/nufofudulojuti.pdf In PDF document text
    • http://goldmustang.ru/files/files/vavaguberemomilevavog.pdfIn PDF document text
    • http://veitali.com/upload/files/66444715963.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kivojepotalofotutafora.pdfIn PDF document text
    • http://chenruichem.com/upload/files/84870909327.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/87558571561.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/64846856262.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/66066412146.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/96215100688.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109161025422356.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/nesakawexeme.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc52781ea---17553404597.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/97524474110.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/nojeru.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141efa9204f3---97491919910.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/50774841250.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/19345236022.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/lemajitekaxekixas.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e29fc3e50a5413f8d090535e5128faac/zitodovezix.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/purenuxapitatugovekuf.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/juxujusofonuteno.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/bikavakifabojorobakix.pdfIn PDF document text
    • http://kd-council.com/upfile/files/mewasu.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/kiziraro.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xujikepujigozobidovadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+recover+deleted+files+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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 17988 bytes
SHA-256: 4aad02a45207b0b3eaf26267f0212c6ed6e264effe06166bf6a1636754571b97
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 10612 bytes
SHA-256: 3029c8c666df3f3f61f31feec47598a50f3234d3cae37fe7e17dee0c678a6c65
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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