Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95b7cbad65cc8ae…

MALICIOUS

PDF

85.2 KB Created: 2021-08-31 23:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e8316db09bd6e1557630ab38bc55937 SHA-1: e7f3c86112aa32a6ce27ceb1056038059f143892 SHA-256: b95b7cbad65cc8ae2fde146028889c471722e5e529a88c31fd1267bffbf65478
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute a secondary payload. The heuristic 'SE_INVOICE_LURE' further supports the phishing pretext, likely aiming to trick users into downloading the linked malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6366c047---tetebabe.pdf In PDF document text
    • http://studiopetrilli.it/userfiles/files/jodonu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mm3nso9oj8ca5i65uoctdqfiv3/kefiwo.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d917faed8b85a2e8dc151ef78024433b/47989046586.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/jozugexupit.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3937af6e2edbf9f9225b3b230858354c/89126088377.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210702_040835.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160981edcba385---91789304528.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/42832987338.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fae4acce89---wavejulapodogopila.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/949ffddc33b673dc6f236e11f2da6f17/54055942744.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wawavategozofavisuka.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0f31d29ef2503d4d71f5cec5040a9269/70966716024.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/60583043368.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760f576e7b3---belevafakimubosakokogab.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/govegagomam.pdfIn PDF document text
    • https://lesura.net/userfiles/file/67581178324.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/todebowajevatifaw.pdfIn PDF document text
    • http://erimti.com/userfiles/file/99469319166.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/73864126062.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/aaf515f805ecdc684344012a0ea387b0/riveda.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6fa21d0cb3d5e66d082373cbd4fd33d9/56927806800.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210721_1F687EFD199B4D3E.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/40291618199.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/307b859557aa1feaa654786e0488bb0d/78876826781.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c946543fa15634b8328364877fe7ef62/suluxexebabiselojaripe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=software+testing+resume+samples+for+3+years+experiencePDF 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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 17992 bytes
SHA-256: e89a32b479569880c445b5603355709ee32387a7cc87a7a41f7030ea387ac6c1
font_01_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 11472 bytes
SHA-256: 850cb792a9affb7316e120b2a331c356c92bdb94a620ec2815fb0f2f89e08bf6