Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffb2a4a0c77c1e1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 09:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 435e5b30250e3772874851c0e1f6329f SHA-1: 949904fa9ac4d6e8ae2904efb9535425277b8273 SHA-256: cffb2a4a0c77c1e12019d9b366541682d87ff56208d60351b9a58ecc4b0e5858
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious content or download further payloads.

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 https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/030afec64cf09ab383c32336d207c5ff/vupejezeluverabixi.pdf In PDF document text
    • https://giriconsultancy.com/content_files/files/megedizoniki.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/wubafusatituveguvime.pdfIn PDF document text
    • https://endobible.com/userfiles/file/33562226770.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/gafirol.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nuvavosozevapofoxemu.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/87813579706.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/61866341447.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131aab72b7d2---vazaxiwoturuxuvavavexoxu.pdfIn PDF document text
    • https://visualarchive.bg/files/sajazebozowobom.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109060744025366.pdfIn PDF document text
    • http://erimti.com/userfiles/file/87988414461.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nuwakeb.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/82610686331.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/pifum.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/seraxav.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/47587826385.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/89181393482.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98366df2a---78933084150.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613399249af3c---70033317732.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161329071c2484---juledelinomukix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+save+pictures+from+instagram+on+android+phonePDF 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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 11264 bytes
SHA-256: ebbece84acfbd6a674cfb7774fd63cb32fafcbacce2d9dbdb72bf7f63ec8e7f3
font_01_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 16588 bytes
SHA-256: 1ab70d15405576434975da9cc30ac0c434a83bc52a9992f948ad3d1d57a4f5dd
font_02_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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