Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbf61d115440858…

MALICIOUS

PDF

89.1 KB Created: 2021-07-03 12:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c3ffde1975f92408f911acf48a2b78a4 SHA-1: d2d4c8a62f974e48202b8382b67b6ddc1e5d88f4 SHA-256: 0fbf61d11544085851865a3f32b90f78c8e11ae93674363ffbdc566c084407b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/271ab82d23a358a77e5f11b16c55c23e/lutanomowotuxegobevad.pdf In PDF document text
    • http://occahomesearch.com/userfiles/files/60966489383.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9saqfrp5bgetg1n4i8cmnjun61/xutor.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/85207246027.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/70073010798.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/tr5p4qa99j7sgcddq4r0akbbeh/12479595554.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/80e57907c38d29827ebde784f941a774/41302275111.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffde4e386---66386045030.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/4bd09f17b7ec4f9764ebb8e10b8463ee/womerobegebok.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/14669984800.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/nozibusenexamoju.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b113261cdd7---4549517884.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/lasokedosafex.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fbc464eba3d26e618d62c992d4730dd6/samenazu.pdfIn PDF document text
    • http://momsystem.ru/public/file/lifen.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160757d661cafb---59333047351.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210620_111028.pdfIn PDF document text
    • http://sinhadventure.com/uploads/file/93867914937.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/jalogode.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/871a56f177fb041dbbc18cb479b15bec/39276520871.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/5dlihgd5jhddctjm5hrk5hkr09/xamawimokivizodisojefog.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d174336e3b3add9a52450741628bcefd/welazowudoroxoxomudetefe.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lujokiminiduwupos.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j1r61g7g50cr5c49ok5c6fk24q/pozenumifijijimejap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wrong+turn+2003+watch+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_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 17412 bytes
SHA-256: 628b5a7ac9bff6db9d4920aa4cd7f1381826394f72a09185777d1166c38556c7
font_01_sfnt_off00012524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3B 11040 bytes
SHA-256: c391a56dd44e98fe1f85b78b935fe0cdfafa707cd78ad448a80066e835c0fbd2