Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ef6a87f67d297e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-29 02:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 41e504402ad3dc6e13e2c88f75004cb5 SHA-1: 9b98d11173361db190a5fdb2dcf1b321ffb2cd67 SHA-256: d8ef6a87f67d297ef2be886e1c8c5902e5f7b8a7a7e4ea62e6c1f056b9982a39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to direct users to download free movies, a common lure for phishing and malware distribution. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, and ClamAV detection confirms its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ispartaorganizasyon.com/ckfinder/upload/files/47146931597.pdf In PDF document text
    • http://dongzzang.com/userfiles/file///fubiwazesegisil.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/toxuwekazerit.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/linadidekizobakidiroxoka.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/34957333011.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdfb3047c449698313100a435edcbe6c/24375575566.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/xetip.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/74241542975.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/55233627981.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/metezomajivaku.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kifef.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/38225676918.pdfIn PDF document text
    • http://megalaserasia.com/upload///98601026522.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/35908480248.pdfIn PDF document text
    • http://myesen.life/userfiles/file/76370243850.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/sonujo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/u31jmnd4ncrg67bk2tb87992fl/5871020752.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dunukubi.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/78164528095.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ae7cd9836540c40e2e85af312da285cf/wasaz.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/48115198846.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0b5309f9c---84359554715.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/nijolipi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/80470895674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lk21+download+film+gratisPDF 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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 19116 bytes
SHA-256: e24b62687952d427b32144548800e9d5a2cf1952055d87bef04d5b8d19d10ccf
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 10872 bytes
SHA-256: 8df70820b88f908a45b44d051df259530a43c31ec82941760746dba3bc6fa42e