Malicious PDF — malware analysis report

Static analysis result for SHA-256 77615eb3b95d95db…

MALICIOUS

PDF

86.8 KB Created: 2021-08-09 09:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e30a9533f807997dc2be6726eb7ec057 SHA-1: 5a99dd94ee88bf02a76328297b8b859508129959 SHA-256: 77615eb3b95d95db41938405f93e8ef1de2846879ccd89f33a4dfdb8d051664a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jevades.com/aircraft/fckimages/file/72175101808.pdf In PDF document text
    • http://atthaya.com/file_media/file_image/file/35755399742.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530f4803f2---45741795073.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d762675f051---megomafinubokovezuw.pdfIn PDF document text
    • https://digicpictures.com/downloads/27489492072.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/fuxejufa.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/41319747247.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c803f4c309---vixepun.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/40237655703.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/85107207919.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/majuzunesufadumixuned.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b109f04ff0---vunijurafuz.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/98599115391.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61013d1b54---75692366767.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ec706b3c---bugawuporinegopekavuvu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/77ee7e64ac96d533b4eae297b6fc52e0/jezajamivapikipuperumu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9563e9169---43553781818.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/garasotoropipukomime.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/sejozi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/aeb2b0817c3cff018e28ee5f776c53df/jajiralomen.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/77718277130.pdfIn PDF document text
    • http://servmed.net/userfiles/file/55360044939.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/87847567042.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f7aa613fb---dovuzovokoruwegagoxubus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=run+8+train+simulator+v2+download+windowsPDF 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_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 10904 bytes
SHA-256: 4fa59e7242cea1284d8e30cecc2773c7434fa188098ef51e91f2c5299dd956b4
font_01_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 16672 bytes
SHA-256: 6d151676a9e4ea338446e12061eb263143d28fcfe91d9c49f722244db03939c7