Malicious PDF — malware analysis report

Static analysis result for SHA-256 6597c0a50c2ddd6f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 01:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b07fbdb115d7569e804b7d654df03ea SHA-1: 74caa58f394b930cccbadd4525478f9a70706a6d SHA-256: 6597c0a50c2ddd6f23f76ecb69a496770e2ff7ba0179e767077fc594b99f6fd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs and link farm structure suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • 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://laborke.ru/uplcv?utm_term=suicide+squad+live+stream PDF link annotation
    • https://bancodevida.com/bancodevida/admin/images/image/file/20660366577.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/pizoz.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f540d40ea38cfb6478a2ee8bd67ce7ec/43568758250.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/risizu.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kogagojosaremixipot.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c41925615---7195934328.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/93906356941.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/kofimidonojiwigutaxunop.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/23689046988.pdfIn PDF document text
    • https://thehouseproduction.net/file/65977832680.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/juzisojuwexawefa.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/kefozarigavelaxitavig.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/72287820440.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905224632.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/zetofepu.pdfIn PDF document text
    • http://gdgom.com/upload/file/210908200350243378lrn8o0hwpsut.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/95584987308.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/neburinewakepawebavuzo.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/kepajojon.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/52475994549.pdfIn PDF document text
    • http://klenderbio.com/upload/files/77229944891.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145907e0a1b7---94855611728.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d373c7aeb---66583939751.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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 10696 bytes
SHA-256: 45c7aa077d087cd2dedb653efc804cdf647efb970dd612987bebb4472cff72bb
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 17540 bytes
SHA-256: 235be0fec7dea6ecced500794e92cce2c3f4bc6949fe9acb3645505f6e38808a