Malicious PDF — malware analysis report

Static analysis result for SHA-256 01684e31340e8dc2…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 01:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 519b40945db315cf5adf62e6f970b635 SHA-1: 72303d213c508e3b3a5a5942a4337cb9f6cf0835 SHA-256: 01684e31340e8dc254c3de7fb7c3c1b3e3708e27c658cbaa0762966879efb152
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/votopilesutamememunewuxup.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/88528913100.pdf
    • http://amphorabeautyclub.com/campannas/file/woxadixebufik.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/ribusesiweniv.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106152057211316.pdf
    • http://parkhigh65.com/clients/4970/File/nuxejimivob.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b5b95de31d378ecf5ac84e958035210c/21286511377.pdf
    • http://norilskgu.ru/userfiles/file/xiwene.pdf
    • http://beiks.info/public/file/63106861777.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/942af4e650225d5a2204260bae245895/taduzekugo.pdf
    • https://cornerstonelaw.eu/userfiles//file/pikovixuwavesokeviv.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ptll4ngc6o2k3o8e8o1quujps/94802724244.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b74e552910ced25f2ab52d001cd50c7/jijivemabagaxowelenutak.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/fruafi7mj7f40ghmluic4h3ubc/misidenapesufudo.pdf
    • https://szekszardportal.hu/userfiles/file/rodugarapevotogagenude.pdf
    • http://cokhisah.com/webroot/img/files/78207848636.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/nosegezizajeterelijalep.pdf
    • http://kfnmdg.com/upfolder/e/files/20210602182207.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2181c3e102---jerejuro.pdf
    • http://adance0112.com/upfile/editor/file/1612001264.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71bb61a7f9---48385327781.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d921e86cafe021876902f9909951928e/gewuribasofefusibodolapu.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb66d71bfab---felemedavorunevorada.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8e731ba4---58216690795.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=git+stash+all+but+one+file
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f624.bin
f570b9db613e6f7706ab1e42b8e59b3b59058e5d077d377e91a1ed3a229b4861
pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 18304 bytes
font_01_sfnt_off00012684.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 16792 bytes
font_02_sfnt_off00013e9b.bin
094801480647e9280d571b654f5d2f8e4b1d8ddd7abc7d585469661f50d6c5ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9B 10488 bytes