Malicious PDF — malware analysis report

Static analysis result for SHA-256 8549c1446f11e722…

MALICIOUS

PDF

68.8 KB Created: 2021-10-03 18:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4a23bbd09801b0dc936dddcd2bba89c6 SHA-1: 098343972a1f043f2b51828a270e91b1c3e0f660 SHA-256: 8549c1446f11e722679842b0358644183de4afa8660e6331696f81254f520fa0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to external websites. Several heuristics indicate that this PDF is designed as a link farm, with some links hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://antitumor.org/filespath/files/20210909195057.pdf In PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/diwuxomudenofefem.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/7737689172.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rk3i3p44aal1hkr4l8ukm4o9d1/rurofexoradam.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/22945473187.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/95810200970.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/jezopifilidurawome.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/40636455386.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/wumonavarep.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/gomixavakosok.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/58235804227.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/60cc230b2988cd996d1dc2dc7fd9d9d9/subebowudujoje.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021100218530643.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/38001404583.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/goriletorozedafesososul.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/1034923546.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/zojurod.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/desiled.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/75490238132.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615319db35071---98754321256.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/negozip.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/62093854d16cd707971811a32ea9c0db/4125968379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=allergic+reaction+in+mouthPDF 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_off0000ae2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2B 15736 bytes
SHA-256: fe9e6655a88ca9264e1822ec624ee92e542d2c5544947c5c1f639654e8c583a9
font_01_sfnt_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 10592 bytes
SHA-256: 5381acd85a27c9f0ebd8118341a7f90abb1b469ab212d75eab869d5a0ec43954