Malicious PDF — malware analysis report

Static analysis result for SHA-256 812eb0f271292e29…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 23:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5726cc02bf0995b354b022a8f5d99dc2 SHA-1: 64a375c4d513bfb4cbcb273c8866af6ddb250ef1 SHA-256: 812eb0f271292e2961985d89da045c4c37707841548d51b5c07f2e05cb39226a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous URLs, many pointing to file upload directories on compromised CMS sites, strongly suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kingdomdatesuae.com/userfiles/files/zovedapotuseza.pdf
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210910102220.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7953fceb33e4d1ac0d68d8e9e979faea/45840844793.pdf
    • https://dveropolis.ru/upload_picture/546878489.pdf
    • http://accessiblevehicleservices.com/userfiles/file/wifegasivujimoxonil.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1d6f28e1---59067310061.pdf
    • http://metaglas.kr/userData/board/file/87520936257.pdf
    • http://eko-gospodarstwo.eu/files/file/jutida.pdf
    • http://gioiacompany.net/images/upload/file/lojig.pdf
    • http://sjhtractor.com/d/files/wetew.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/67083366170.pdf
    • https://theshamrockpublecco.it/file/45993009973.pdf
    • http://vstarmp.cn/upload/files/20210908_234333.pdf
    • https://taumed.kz/upload/2021/09files/210905083245893170a3kgm.pdf
    • https://bepxuyenviet.com/upload/files/tojagigepakibenaf.pdf
    • http://kuryakyn.ru/userfiles/file/xukiwabusofizuso.pdf
    • http://xhzhengli.com/upload/14018406283.pdf
    • http://totoumi.jp/upload/file/belozijonezivojuxigonelu.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/17252862944.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/86433429458.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2aa5139aa---20259201503.pdf
    • http://highendschmiede.de/highendfiles/file/9926359375.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/91223056149.pdf
    • http://craft-personal.de/userfiles/file/bepusaxitalabewadeb.pdf
    • http://dansecyr.ca/pdf/file/musosazosibanofaletige.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+fate+of+the+furious+full+movie+in+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9fc.bin
203871b550e8adba3690fd2fe7d1f3b6b744ee01754758c75ca77646b7d53dc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FC 17620 bytes
font_01_sfnt_off0000e7a0.bin
bf53ded93d6a0234a5bcbac421ed324b875ee9fe8b680c426c8df2c446bc7603
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 10792 bytes
font_02_sfnt_off0001005b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 16792 bytes