Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a3bfc15004d103…

MALICIOUS

PDF

84.9 KB Created: 2021-07-16 22:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c7e36e2ff848f9da31dd9bb8cac4ca91 SHA-1: 1485603025d82ca457c8297b48675d959ea6e3ba SHA-256: c7a3bfc15004d103285148b7d3eeabd0a6a9c0a8b65a3eb12ed01d6791430736
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a browser extension installation lure, a common social engineering tactic. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c59732f0ccc---94801504528.pdf In PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/43047025083.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a61115ffc286ce5fcb9fa763b4f132dd/92841980261.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/39051699992.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e117e60219177c588c4f0bdb7f1430fc/61604196541.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qrt87m8l9lbs078i1vep1dbpmc/fenipigunetamo.pdfIn PDF document text
    • http://yuhongzg.com/d/files/wodiwilokiwopumemizetetu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aeca53398---67983734211.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607636e809188---32245395484.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/54267760060.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f94ac9988244153a42c9c3965541ebe/95361772823.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9aef882ef---10584135832.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/81522591392.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/40580955475.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/16473864370.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d7135e8f---40405415363.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/lolepewexironi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/b54ea606077521fe95f76371a7d02716/mutidoxibimodirek.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ac3204992723aea9ee5b1e7251287e56/56143828757.pdfIn PDF document text
    • https://estoniapools.com/contents//files/jufurisi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/56d3afae2551286c1f8762d3f21ea65d/24036551696.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/xasegulabenodo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160783b8a7f80e---20066296116.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430233145346519.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/49620263328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=open+vcex+files+online+freePDF 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_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 10404 bytes
SHA-256: 491c6575192a9425d7c09f2ab24c6a21f78d5f887294e67c3e238cdd72358c6d
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 16848 bytes
SHA-256: 122a76921c314a2f91e54fb28f232353e128dac30566e8dd6e88be2d25be7a65
font_02_sfnt_off00012e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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