Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c8c4889e3e077b…

MALICIOUS

PDF

106.8 KB Created: 2021-08-05 02:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b623713254bf55044289a22ed9d265e9 SHA-1: c79c058f05efffd07b12249d0829301be8a7c379 SHA-256: 49c8c4889e3e077b90ffafdccc198ed3f23b39d7a9cc7985bb1bcb4a6bb059be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 http://farmaciafici.com/userfiles/files/90821907353.pdf In PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/22131737028.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9a3d650e8bc4bb2993c32b1369b7f012/82050867878.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c516260d7---52258845914.pdfIn PDF document text
    • http://vtaky.sk/media/file/jejaxepom.pdfIn PDF document text
    • https://asiajitu.com/contents//files/setovefuvulob.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4716c557d9bfce2f79fa74be84a55230/20208688204.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/denafiwosan.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16236011843964.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/4654652419.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/jopegijofajezejekofuni.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d65ea3a6---53297619207.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5uqee59ns93le4fjl3qhrif5m3/tujawuvuwuwikutopulizozu.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/70501248068.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/tedofavasiror.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e63195534983c1bc1b90c7a2ed4629f4/kizojibedi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/320ebca10b2db2657520e36d314ff6c1/tefaf.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a346828f163---losisakaluxexoxiferi.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/86784101089.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/konojuvur.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/77113827130.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/remudimepaw.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9695eda4af2dbdde7f72c6bc97a0d259/20428595391.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/90418257647.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c4ef8b8b0fa0173daea17b1f0374596f/27008346266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=need+for+speed+most+wanted+ps4+release+datePDF 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_off00013da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BC 10708 bytes
SHA-256: fd97f02e7f94fabdb95c788418409bdaa351284eb1b6d94d3a426300ddd9acab
font_02_sfnt_off00016e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6F 17592 bytes
SHA-256: c15cc3e79fed6cc3498c73a1622bf5859359eb2cbebd3ce0da4d0433db3081b5