Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cbbb1c9c9d3693…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 13:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1674ec560cb03c983c51c21be50e2c87 SHA-1: 2772869e90dec3bc6eb65e85395ac891b48faa8d SHA-256: b7cbbb1c9c9d3693edc96e47395256c3642bce3090a1b4a1471099c73d7f433d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to download and execute further malicious payloads. The PDF also features a link farm pointing to various compromised websites, suggesting an attempt to distribute malware or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/kenupofulanozujuravawigip.pdf In PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/90478097362.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe26e4eca5---jabojelojipeved.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/kixibapabarimuf.pdfIn PDF document text
    • http://toroisg.com/public/images/files/jivabixezedipivukoraji.pdfIn PDF document text
    • http://trivio.it/userfiles/files/dalejanujuzegeniposomepi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d400df62f---fevuzopozeteko.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/kewafisofojogukasaz.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/sigapezewoke.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ang4rlv8lq5b3q8msnhbddkiec/31748883348.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/36592035587.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31671241496.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/45790824014.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tiferije.pdfIn PDF document text
    • https://blokhol.com/upload/files/gopur.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/136034652.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613236a6e11ad.pdfIn PDF document text
    • https://nomortiga.com/contents/files/lijikazozesidigodanureb.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/gilusovufunudeduworul.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/59489964447.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/jowufagevaxoka.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/lenejixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gaming+turbo+downloadPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 17720 bytes
SHA-256: 5ba78f93765a3f8e7937ca4b4459c05fc5fa54753d724faf7d937cd6c57a7acd
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 10656 bytes
SHA-256: de1736846ab314fe6da49cb6f6fd69624fd8a25a0446f0becdab49666040f9e2