Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13133e33d66f570…

MALICIOUS

PDF

88.1 KB Created: 2021-08-25 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b6dbe2896099905de7ab97fe4691de9 SHA-1: 8d01265ca0b5e14e08128285d7dcf909a330ac14 SHA-256: c13133e33d66f5706c93d0ccc18423b95ec38efdda26460076da94f072cced09
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external links, including one to 'http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/mitiludamatusefuviz.pdf'. The presence of JavaScript and the suspicious nature of the URLs suggest an attempt to download and execute a secondary payload or redirect the user to a malicious site. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=how+to+not+fall+asleep+while+driving PDF link annotation
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/mitiludamatusefuviz.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507263a52b---20226039230.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/73e6b1f6c5268570dcb86e6e5fb460fe/tebigujulikofebaropebesuw.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2ab6d4666f2aaaebca53a5574329d161/19238220836.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ff73b05e675---3931061608.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/tetejobid.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/29800688505.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/jidozarasimizovisujoju.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8tq3h6rlualvdh57484onv49uc/24257679267.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/58807077568.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/zoxumukivafobifijewil.pdfIn PDF document text
    • http://zzweien.com/d/files/67050269675.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106051648106450.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/99422520291.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/64840484964.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/96818697029.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5c3fcd804ca0f8e21dc02825d8207d82/jasilojawaxikobetuwux.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cd706a032---44953547868.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/15278005852.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/83263610122.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee031d741dd---pozudigusoxuzolasok.pdfIn PDF document text
    • 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_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16740 bytes
SHA-256: 5c45389cc258116c011a9564e1ee45fa0a0ed392280963f5d086c69ba70a5b4b
font_01_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 10920 bytes
SHA-256: 21c713098fd3efe5d9ad2474715d14aaaa5af95b5c72c34ba58aea7f61aae1ea

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