Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3213f8480211e9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 10:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d0fbfb7c0687652a38859b96423c475 SHA-1: 013c46601300a089fa5b834621d82e4607da3d64 SHA-256: 2b3213f8480211e924912ae73c6caf2cc2567c10603fbdf5d9d0c49595e1a472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=non+finite+verbs+exercises+with+answers+pdf PDF link annotation
    • https://editions-tlp.fr/ckfinder/userfiles/files/86271391280.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/bazatovob.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/91959293604.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108160143141058.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/79aa38b88fe055a49ac2cd0099bde1a9/jamumutubanubotaziz.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/nazidigezawazipemopu.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/masuvekexuvozuwamaxexoxi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c626a3b84d88988de48a0a039ac13409/suwatamurilixadimutusisud.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/12112689069.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f4a2adb2e957aaec9ed5425af6472a9f/loponubofojanuf.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bd89e251b5cfdc66215032039d965093/5321309986.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792d7f9a8d2---veradetaruver.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab871b1d6c6---7693268267.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160911a405a996---kerewepikamexajanodara.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c6ab0b17---nurevo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8nimnrclv49djub3bs80ejhmqr/niwibaxatebutogisozizakaz.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/76867087791.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/kuwokojofab.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0a8ff031cf121937598c004fd5cb6a4d/80093993843.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/41953946382.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/50935329931.pdfIn PDF document text
    • http://benetalent.com/upload/files/74216186548.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/93179765692.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/uahvkdp9tcqsennk31immikfpt/wirojisexu.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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 11044 bytes
SHA-256: 4f56a8ea561fc37ac066afd319cc3f1caa7afbb02194ba9afb8817c0b9b15b48
font_02_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 16408 bytes
SHA-256: 1f34f714e680c6e7f57342ee62237606d2e406f274b057ed6845d63d004db49f

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