Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d84934f69ec229…

MALICIOUS

PDF

85.5 KB Created: 2021-07-28 00:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a355eb380853eef380d36d2c49db10a0 SHA-1: d4bda52cf83497741c2eae3cb8755a18709d4955 SHA-256: b7d84934f69ec2291eb46699ae9b013775c4c2749d31c3e49b21b6c7d869bbd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://unseretochter.ch/images/file/zozefodazapesar.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df659189c56---zegawefutexedokoseja.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/62005023222.pdfIn PDF document text
    • http://debden.org/userfiles/file/59121173856.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb0fdd977---71723375890.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/pozarewezofiv.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/vemofarejatinafeka.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9bd31c0e4e01ab60b85afb02993847e3/11327867474.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/rulelesavebefipud.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/kiberarafen.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a83638f7b---24471612755.pdfIn PDF document text
    • https://la-klamm.org/Files/files/92926000379.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ba0b15d8---17295662909.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/nigelazom.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a89b9f014c---33381593615.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160850214a9755---tabajeve.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/74687044490.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaec883ef---53957235539.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/652eda1a339070064f96414b5fe38bcf/jejibamikofupew.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ad4bdaba---dejivinolum.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/76e1deb354b991b856b115fa5b46075a/5755073710.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6e07bac6edc6e74562c25662935a95ca/77115770340.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/vomogesovelupotasonotuz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6267a24cb6---kejisomekotovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=house+flipping+business+plan+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_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 16476 bytes
SHA-256: e2f8910b687580f50ba65f5c0285df8590bf2d6f485241a323d133646e160646
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 10708 bytes
SHA-256: 5c53b5b19bbcf10cf6fec84493d83cb424a982d24efc2a2d1490b0050fb102bf
font_02_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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