Malicious PDF — malware analysis report

Static analysis result for SHA-256 7741e09f94648bc0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 14:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdf63e426715b370a1d1baad6ffd3ccb SHA-1: 3a29e7e09651efc937f17a85befb664378ec9efc SHA-256: 7741e09f94648bc0d7902c3f5eb9ec3c94e28ccb2a703fce9b632b04f58c0da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://scpt.it/userfiles/files/jalivukafaxamifofike.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/penotutadinujirofiniv.pdfIn PDF document text
    • http://kmsenior.org/file/files/75487868404.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h4f7k8mepftt6dce34qgnostu6/zituvo.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/75875182109.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t6numr14jlvc0e9b7jrcckevch/botemolaxivavorixawema.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/tedaga.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df36e6f097---18403113060.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/30448143591.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bigipisovav.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/75153617729.pdfIn PDF document text
    • http://gojjang.com/uploads/files/76060944906.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/jabarilozigizogojufovoluk.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/1980003601.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/37737635391.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/45142850741.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210914181455.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vunusalavinijogigi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/11d9e46bc86c4dbaff9e0ea531758c62/pakeluwe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131da36d51d9---13717588359.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/vivutufevofe.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/28588389850.pdfIn PDF document text
    • http://reylab.com/userfiles/file/58456158139.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/guxitatufejiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=luxor+amun+rising+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC971 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_01_sfnt_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 23204 bytes
SHA-256: af00edfc85dd8c354c65dda14d50481d4a029a38b2ca945bf9886218496bd403
font_03_sfnt_off00012414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 10568 bytes
SHA-256: ddf8d34ada8ffeaaa892f223847b16d3848e8fdd510b6ba8c42045aa599f958d

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