Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8130fc968c3ada6…

MALICIOUS

PDF

100.6 KB Created: 2021-09-18 00:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1b9d994ca51610967dd932b772838a9 SHA-1: ef9b8ef4f4aad8b1cbc3dedad6f09af7d349f62a SHA-256: a8130fc968c3ada68904cb588a1201c53bf593bd5175ca7379b389e264178c5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many of which point to compromised CMS upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of embedded JavaScript, although not directly analyzed for malicious behavior in this report, is a common vector for exploiting PDF vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://nsmpublicschool.org/slbdavbatala/userfiles/file/vugewiwenebuweturu.pdf In PDF document text
    • http://bimbrlata.cz/UserFiles/File/85259751383.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/35235405911.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/senevoleguji.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/ralagoxowodugasipizalik.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/24908931163.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/88834428750.pdfIn PDF document text
    • http://goldmustang.com/files/files/sitegojopuxetugi.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/lupevixixelomafawagive.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/41341834172.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/buvobeziladomu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/povadezegen.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613919e077cb0---48973647489.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614501e9d4bac---2868246572.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/71406324797.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/15500419725.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bilon.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/muwedegajewijawinola.pdfIn PDF document text
    • https://ratodua.com/contents/files/21750414522.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/73673960417.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/55087100044.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141aed47ff79---pufebizuwifuwilum.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/girixudane.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/lidejupazidarub.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3fa381c7---tugiseridewum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cyberpunk+red+core+rulebook+pdfPDF 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_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10572 bytes
SHA-256: 71992111e11f795a466996328e96ffacb21ad10197359e4a41fe5d9f2fbc26aa
font_01_sfnt_off00013b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B86 19104 bytes
SHA-256: 175d9c4efa62e2734298b26dc4aa47346d70e09f25a971f9c3c7503827f5654f
font_02_sfnt_off00016cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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