Malicious PDF — malware analysis report

Static analysis result for SHA-256 f809e166b059b34d…

MALICIOUS

PDF

91.7 KB Created: 2021-07-22 02:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 679167a4e18da293bf206f98880f34a6 SHA-1: a9aafb4220b451bbdc8faa452bbba99b70148c40 SHA-256: f809e166b059b34d36ac534ecd5c43a5b953dc9ea0cb88ac1bd2b160b652d3f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2972bea4f46fc9332b5ec513cb5d0923/demufuzuzepupi.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/83506330126.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/05b486525a6fd6f09f61c254a2621574/xujaladike.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/27062399751.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160717b55b3896---wixerokupegilokibisa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6603b027e---55189859865.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/50042127236.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/58358476769.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b518feaf462---55307023242.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/95820196903.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/16506024051.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160908bee198e4---99182455799.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4921d65b3a---57665565212.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160875709756df---30623914902.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/60492826467.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/on43t88cnos2php2n4s6q3lth2/22862570683.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/34219902366.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/52904987338.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a36dc4ce5---251736676.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/69635975861.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/bukezopanafodox.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ac203b8e4---94516783489.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e3970aea20d66b14cf5080260bec6e98/18244481645.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b7b90933d5c9184d6122661dcf5af6c7/wenezuxekisibifuxonanot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=blessings+for+son+on+his+birthdayPDF 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_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 10940 bytes
SHA-256: e1bdd311c909206a9541be32a6784c1f1f283c9fdbdf0c30a201a4baf99334b4
font_02_sfnt_off00013766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13766 16044 bytes
SHA-256: 15b812b7f6f2cb5a13b77f523300ab6cc7dd2a90adf0ac28dd85bdd9fecd7fa7

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