Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24463d4399e3830…

MALICIOUS

PDF

84.0 KB Created: 2021-08-06 09:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c2312eb84821691d0e9daf52f8f72b0 SHA-1: b40e4e50fb88e375c7ea35db4792b9dd2111b3cd SHA-256: d24463d4399e38308849021104c1c06d462bfc20696bdfe87755ae918cd8f2e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pavimenti.pl/web/uploads/files/bonatotubozugagomo.pdf In PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qv7o00gfanermkipv3plsgfvtq/9272500394.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/81894636811.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94e5716df---82181863870.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/romokinozolikujalom.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tekipipanasuviwufe.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/vipobonowuvutaga.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210727_fcb35.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1b4dflt09n8q7llrhselkov530/12662022802.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c497c5ef088---kuwanuworiga.pdfIn PDF document text
    • http://rld-carbon.ru/file/32188863458.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e53fc20f889---36551994136.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8290ad6af8f4205ea545156fc7e61864/tuvojunubibelaf.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/sobumajujosunosutef.pdfIn PDF document text
    • https://europartner2.pl/uploads/fuzonakonefigopexegolo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b580fb9efa6---jezeg.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510220307819174.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/4rru6bse43p060h9524no0hn41/xenamilipatetamusugo.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/35187824892.pdfIn PDF document text
    • http://veivel.com/userfiles/file/36785365045.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/wukomadobuxokezijatibo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jt678s4qid6fja2al4iq38gu1s/mikekekosexi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8003477ffe3eab936e15054c7a118bc/wojosikatigo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a733d76b470---15650470260.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/dumotebololose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jeepers+creepers+3+full+movie+in+hindi+dubbed+hd+downloadPDF 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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 11344 bytes
SHA-256: d20b956e6b6b2c78b9186c203b039f7ef6bb7a032bbfb52d4df0f1e92c8181fd
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 16904 bytes
SHA-256: daeba203910317ac8a81a4c644b69fe3e98d63d54781383d244ff5bb8519507c