Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7b54c18007298f…

MALICIOUS

PDF

66.8 KB Created: 2021-09-25 15:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 323edc87416acc343a441714debe078b SHA-1: ba26874ab2823974c21cbbdc544aa7ff1e3f05a1 SHA-256: ab7b54c18007298f6c9f4c7a7fa9854798f8b5b6ef2131513658c4404f2bde11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://photopuzzle.net/userData/board/file/zosif.pdf In PDF document text
    • http://agisinfo.ru/uploads/content/files/32568464754.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/38605501636.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/vobibotute.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16134679fb297c---24450385348.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xepux.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tutexuzupegogedewonok.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1e9176a7f7f3385bd083666005855a41/ruxudafubatojo.pdfIn PDF document text
    • https://rosycaffe.com/file/lepemelenum.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/14205356578.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/lugogoz.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161449011cea05---67085005940.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/fomajetam.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/89913945126.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/77480446279.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/13253294814.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/bafekumixo.pdfIn PDF document text
    • http://njxinbell.com/upload/files/legamivor.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/4584737990.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/lisoguwejobosomojinenov.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/39207666344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nikki+mod+apkPDF 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_off0000ab57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC369 14688 bytes
SHA-256: e11a9471872a57e0e6f379ddb93a01e82d86cd3e39a5e1413b696edca60c199f
font_02_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 9976 bytes
SHA-256: 73d9b9e5d83b378131b2ba09189fdbd3956878dfc4560f8d70585cf9ae7d038b