Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffdb4086ebed4cf…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 23:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef8584e6f820610c0db51df10a1f097a SHA-1: d0e44412758c64ff2c595d8d3ba8a223989c91cc SHA-256: 2ffdb4086ebed4cf8acc9991b0d1cff6a50b5a04027756f9d36fd58f2e00c53d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress uploads and disposable hosting, with one URL specifically mentioning 'download super vpn premium', suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of multiple external links and the heuristic firings strongly suggest a phishing or downloader attack pattern.

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://wastran.ru/uplcv?utm_term=download+super+vpn+premium PDF link annotation
    • http://fsnmmaterials.com/UPFILE/userfiles/files/natiminaje.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/19433009484.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/vidinidewatemejibu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137953a09c79---sogopapave.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613688e0e45a9---41775899695.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/puminolovedawa.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b7dd139c162d5fc916da4a090783f7db/mozug.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68457089973.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/5313618718.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/38724296945.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/viwali.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/digobe.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612f0dc71cf9b.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/31886671282.pdfIn PDF document text
    • http://lactopad.com/uploads/files/23445158831.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3d97e92b59b55a854aa04b01e0df7207/26818608771.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613693d2e1f88---88306260606.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/44310597491.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/bexebogikimanimivaxaxi.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/kamobimibewenusipofusi.pdfIn PDF document text
    • https://italvaping.com/file/76456172356.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/64624185287.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/13489034071.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/lumoxofogaputinegoxaveniw.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/72691016764.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_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 17624 bytes
SHA-256: 4b22ab23640b246f362f8f5d5d0412739a3faec5dd7bfa05321cdd49809f0b3c
font_02_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 10708 bytes
SHA-256: b84bf817817d3db37effc45be1b232110dfb418324957d6bcfa8798d6b6d34b6

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