Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb935adb05516fc…

MALICIOUS

PDF

306.6 KB Created: 2021-08-23 13:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d0df66612e9477876cd5bef31f53902 SHA-1: 2b16f8cdbe3039863070a64fe1f26c5b4af6ef86 SHA-256: ffb935adb05516fc22db5ebf203d3c6237b30251646f9c915f08119b316e3001
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, likely intended to host malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and a 'download button' heuristic further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9162

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=best+hot+tamales+near+me PDF link annotation
    • http://kowel.com/ckfinder/userfiles/files/1626331569.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sa4grjio4ae9tc7ssu5d55fm45/71099594755.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/11360535804.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e188c45bd3a85ebb889d408541f090f/6489930279.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/512dffe415bd32316a3f8faef9fa88d7/xoxurazibupuwalenorenul.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/6856006827.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/64838034189.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05f500f73d---97307915644.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/figotigevixafoxixojate.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/67022571417.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/lanakabegududazapudaveri.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160868e6e2f3c5---medapanurageferoz.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/judoduleragamuse.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/46907441034.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/famezesofi.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/13163521748.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4b7e733277a52865d77b778aa7ec35ce/depovigero.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/xawomi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6fc0e17dbe08cf64c122ad9dd6feffcc/82656377459.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/bafufukazafomag.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/17597879580.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/16780294722.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_off0004599c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4599C 10332 bytes
SHA-256: 9492b123c8fd94fa7fd8a7887b33e57d5d52af0bf05e0d72adfdbd923ac499db
font_01_sfnt_off000470c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x470C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000488d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x488D9 18628 bytes
SHA-256: 21c6288c673e9fc54ac1ad69007418a2c344bd2f9a185a2787b4f52569a94b9c