Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a1fef1e8dabcff…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 10:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25c918f47e3160c6b67e186efa7e1d86 SHA-1: 7abe4d424c1fe2309046c17fae481a5a631e7f56 SHA-256: 03a1fef1e8dabcff9660120387d3d9140e11fa62340ed61b98d256d7b59bfc05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, a common tactic for phishing or malware distribution. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The embedded URLs suggest the primary function is to redirect users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://firewheels.pe/userfiles/file/womevub.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f62ca71f636---dikifo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/13040945998.pdfIn PDF document text
    • http://brukbet.com/user_images/file/86512471059.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce9552d0d---dirurevufogas.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/musebimopazuwoniladivu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/kifolozozewepumemewa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d528942a---nonisewovuf.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/19776411033.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/12e9547dfff11b234246dad41800ad9e/76010840251.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tuwuvomuvovesolasanag.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/50110633158.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/6466b21ad899f5e1eccdb1eca24a36e8/juzoxidupiji.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/wiwijowavalejapipasogepu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9014e13de---94857422398.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/zajipodedaduxezasulu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/49712886540.pdfIn PDF document text
    • http://gardatrans.com/content/Files/56461096505.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/refufuropujibexuzufugoz.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/vowidowopikaw.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/63068594082.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/42c2ee3ebc76552809c3889ab4ae9c9b/woxel.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/5lgtoc8a60edaecghv7pe3dv9c/11767962392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hectare+to+kathaPDF 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_off0000b86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 16448 bytes
SHA-256: 2df342c037ad7e668e7ec6fda5eca24a8d2af72bf3c84e39199a2d1f2926a462
font_02_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 10000 bytes
SHA-256: 20e07f4f116ed9f04dfe21b71fcd89d43f04f993a61c356431a597079ed3338c

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