Malicious PDF — malware analysis report

Static analysis result for SHA-256 3279c698ea16068b…

MALICIOUS

PDF

130.0 KB Created: 2021-06-28 14:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57dffa65c7124885af46ee84a1c944ad SHA-1: 89ff0473a6a12f12c33b52ea1f78c05eb5d171f5 SHA-256: 3279c698ea16068b38c1ad86cf80fed0ad0b4abefb481395362f2a9412307f03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://leavereview.com/customerinterview/ckfinder/userfiles/files/jidazux.pdf In PDF document text
    • http://arunimaflavours.com/userfiles/file/maxatoxo.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/h8bdkov7fu58tuspkj9b9md8pq/vilipigobujisatulivage.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/623ede271c142b6eaf9e83aaa18d8220/redulodopi.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/rezafaze.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1005799f32---49849816443.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10830d2c2---wutobesolizexew.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/92472530069.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/516aa15f04005d68749917fad8d8dfc4/karevudilewezijotimul.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/refanowegobopabexo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/68847929836.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a322ba989a67e3ca97d5e1d6c3cbc539/3743772381.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cab9be2af06---69962035267.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8500f6de4b58fc279d253c1cd95b8a14/suwosezerafeg.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/samijevomupalenopug.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qaoa3bvogofqk5apfjdblsq8v6/80952947368.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/biwad.pdfIn PDF document text
    • http://vce34.ru/attachments/file/jugedilamuvolipumosepitum.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2e4fadccc229f53a9a46befb2229d014/pujexewusokegix.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8e0e1312cc4457fac76e2d8d2abbdbb0/75134883476.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbf5d5494428c5b8ac853a9a38853a06/71798120131.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/50827857401.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06948bbc38---xunefugutewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hp+lovecraft+housePDF 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_off00019ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE0 16724 bytes
SHA-256: 4297d1b944c8fd4d07e9e9f8e48179925d8de21add28701b1bcc56d8da41a00d
font_01_sfnt_off0001ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA31 10540 bytes
SHA-256: f6821d98b637b82c0e6c11bddbb9a72f9f79f7214482071e831d7424f071c328
font_02_sfnt_off0001e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1