Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadad98da474037b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 09:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c4e960c841c02d15bafdbe9b10d4370c SHA-1: 8b0280b109581e2492c500e18a00daa093d81d3e SHA-256: dadad98da474037bca50d7309380ca74922c0999b5b788a30e2ee8a1a861820f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://tobolsk.fluentrussia.ru/img/content/files/tomirovimeduvarukajuso.pdf In PDF document text
    • http://ecohouse-lab.com/userfiles/file/lipupi.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/zivuxagulovowevonogixete.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/6278270155.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/wuxezeforedetusomolez.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/wijuwodawumedolejaxoki.pdfIn PDF document text
    • https://accessnepal.org/userfiles/file/gagupojigalovimi.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/867684341.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/54143574677.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/56925304842.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109110513373861.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/doxesizugula.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/effcf38cd6dfe88a2c88241ff95d33b2/buwokodevatad.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gqflke3567gmsslunlq8rri6l5/49511647549.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/tukipesaz.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/rulesozidon.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c02e8f256c3f4213a558abf5ccac1518/vodagasasazep.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/botapelafep.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/78199341785.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/noladewuxofofabi.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/19494167706133d2b534b91.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/katitofodewudavaromenazu.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/50567022995.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/15919579429.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/7923453433.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/45232173329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chat+gratis+androidPDF 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_off0000b69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 15452 bytes
SHA-256: 3b1c2fc1ee1991afdb30381135881f61ab1d8a41ef8334d7b475ce1f2e787b71
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10380 bytes
SHA-256: 11ce65b73e67419966595d67e8483e70a053b0c5f406c1327862589df337ca5c

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