Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2b63e77bcdc440…

MALICIOUS

PDF

83.3 KB Created: 2021-07-20 03:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 209310da24d3dbf03dead5008bf74ea1 SHA-1: aaac93e29592c9d60fd01830d8fc6f9c174dcfbd SHA-256: dc2b63e77bcdc44045407ab008f01546cd04f7ef6da3182d97c8ed456d0c2c35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of embedded URLs and the heuristic findings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/gofozijarab.pdf In PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d3710bca3291eb68e4a5daca48bfffd1/toferafuvebuxarogakadomu.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/92115902195.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/32538663830.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9153446bb---24543004599.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc113f29db---jirewivukonulofoxi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebcf07fc3cc70152e9dbc102cc680f0d/46477391789.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6j3ci41ekcsg67vsp8gmb7bh5h/30293357812.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/87234897645.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/tixegu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb96ea65c70---gumotujirugibovaxosob.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/4709462338.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/09hg2u1sr96cvkrsnsbfumarpg/9119985369.pdfIn PDF document text
    • http://toonesk.com/upload/mamoxokaritaker.pdfIn PDF document text
    • http://seritour.com/rsm/files/wuwunanak.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d326e8692---17711398623.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1a7a46f4---36041239175.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/komobibinavonak.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075179b5f61c---82161770153.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/84549928996.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607709847e8e7---zuwulepe.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c091b91ee69---75040546061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ssc+board+question+papers+pdf+download+2020PDF 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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 11404 bytes
SHA-256: f75d0fff340613b6e6abc0cd32d502d8e399cb48539be5321ba974524a510669
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 17296 bytes
SHA-256: 45bbbc4f2fff0d29ff2048ff5429cf4a918e25c1e03509a5deb81072f3bba06c

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