Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c163b9ba8b42ae…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 14:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f62f68e9d75aebb941bb29528eebd081 SHA-1: d32484a64276f4ba68c2e436abeace508707a4ec SHA-256: 93c163b9ba8b42aecb463c399c82d7cbc3cd0a27d4c00ac9d9030d1fa727d7cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brahmagnanam.org/fck_uploads/file/50297055331.pdf In PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/jawinodazeza.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/gotimarorolitutefar.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161380a57f1bae---61084154124.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sadivuvujelozosamuzi.pdfIn PDF document text
    • http://headrepublic.pl/images/files/59645995902.pdfIn PDF document text
    • http://potya.com/32257952526.pdfIn PDF document text
    • https://taperagi.com/contents/files/53380258561.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/guwadiwopomudutapasideku.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210904211722.pdfIn PDF document text
    • https://securitydm.net/slicice/file/64721838547.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/tevodujapevirubixinura.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/72058d5244298e6bec86fc824994157c/78109915969.pdfIn PDF document text
    • https://phr4u.com/files/31873280734.pdfIn PDF document text
    • http://candientuvibra.com/images/file/79744783278.pdfIn PDF document text
    • http://christopherdallo.com/file/88242736172.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ik67t5ke52a0dihtosp3haj3a1/tufivetonebez.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/xarejodu.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/55039674980.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/wemepigaseberadukedazo.pdfIn PDF document text
    • http://househouse.it/userfiles/files/tojepolomudebenos.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///31800091367.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/70255855179.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/ronodubenegutezagux.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/25391834765.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/zujixulotafudus.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7c6e1ac05cf3be13dd9bd30ec7c2ed1e/dememafudo.pdfIn PDF document text
    • http://canadianrockies.info/files/file/kikomamiwoligolojin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kiran+ssc+general+awareness+2018+pdfPDF 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_off0000c4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 11156 bytes
SHA-256: 1f14db4699174afbc07ac33910da94afbcf63392a5233f15ba3e9808254489b8
font_02_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 16408 bytes
SHA-256: eaeaca787bd60e684e2f5e1fc54c061851198051398076a59746037c83e95b7a

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