Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83908907561abf6…

MALICIOUS

PDF

74.5 KB Created: 2021-09-25 18:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b71a5b6fe4d93de05c2194804697a3c4 SHA-1: ba4fed9c79fb44f903f8903dfe69de43eb5fbac5 SHA-256: c83908907561abf6708f1eead968fc22dc5269fb494b7cab30e906b60a904bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm. Heuristics indicate these links are likely used for SEO manipulation or to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pistant.ru/uplcv?utm_term=a+and+p+short+story+pdf PDF link annotation
    • http://gesundheit-im-blog.de/userfiles/file/mowibibametediwefulov.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/meramoresafofonobewa.pdfIn PDF document text
    • https://nada70.org/userfiles/file/jevid.pdfIn PDF document text
    • http://spharma.ua/files/file/32466731121.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/sixusabovamub.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/55343793655.pdfIn PDF document text
    • http://rafaelokazakov.com/file/42925286901.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/26774925013.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/wekivaxikuxikosaxiv.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/peretojesixakiruveg.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/81339466081.pdfIn PDF document text
    • http://w-mill.jp/images/file/gewekuwemojenakaverizobak.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f116e4745---polivazifotakowejuwe.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fb3f1f2d24aecddc83e60d7bb2e3b98e/sudilelikovuparovotesa.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e470552393fe7f49c4608d116ff4a19a/66770936684.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/1170916850.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137db5de3d47---54099439050.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/77348133778.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/melatiwez.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/1204947175.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/21293985339.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/75925975975.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/69484125545.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/94101528928.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/govibanalopoponulevilugiw.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7299e5806---nomafode.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/surujesaxeg.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_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD496 18844 bytes
SHA-256: a3dfee383fdd2520346b744def3fa32ae4a045243e83ef017654791db82d3666
font_02_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 10420 bytes
SHA-256: fa67a1346f3afaba64213ffe587316bb39f2b2221703a3f1ccf4f13fc5dafb85

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