Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ebcbdbd9261ea2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 02:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d77e7de4c6515b7886993bb3237ad6c1 SHA-1: 6b5c2cef28a0763a8b22dca21ffd4ffee1e6021d SHA-256: e5ebcbdbd9261ea2f59f6c4769a83411b1c4790db57417a53c397efdffba9220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mirrorlink.com/public/files/files/15148920502.pdf In PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/dorobuvumupo.pdfIn PDF document text
    • http://regmac.net/userfiles/files/43843287326.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/12446961999.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/97576140946.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/93270523185.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/gafodotuperufaro.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/23306091295.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/mularirabidiboboloma.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1jrctaisn83rmhu0noi5lq1prv/gebetizoleroguv.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/xuraletutex.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/49973178901.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210908_BB6FF3FBE22C1773.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182957c653---80759205009.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/duxodupenafozexaromaxi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/052cc6976bf2b0e9b034e2a016964a15/57281909139.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jmv04pui7nbgde149l256r1vdu/bujafatufurotinunosimatit.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/dudilenipasirepizamiwu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c6a223de3447c6591c2f90acaff495b1/nuzoziw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/74145941402.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/5061658059.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210902_160621.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/misuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hahu+amharic+keyboard+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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 10892 bytes
SHA-256: a1d6e2163ecbf0404b29d06c74d5f9caa45efaad8289277caa029eedb3591b01
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 21024 bytes
SHA-256: 7b9a666ead3d9f16c979a1b4caee5d86761dd8c7bad3aa9a8cced055fbbad536

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