Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcc38d7b82d493f…

MALICIOUS

PDF

93.8 KB Created: 2021-07-23 16:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 356c463375f0c73f31e13d7c6e3811ba SHA-1: 6b1dd0dcf4445d986fce7728feb98356e658b1ba SHA-256: cbcc38d7b82d493fc1ef10ecaa4cfb7dc34c78861bf6fb50a35824f25db59b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. While no scripts were extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716abc54583---tosukejiwibuf.pdf In PDF document text
    • https://calendarsunrooms.com/userfiles/files/57990510661.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/likukuvesofowofi.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/lexapazepopum.pdfIn PDF document text
    • http://contelex.it/userfiles/files/2722076858.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b75ad1f4---43530529848.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/pamemiruta.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/dibobaxapubozuparipod.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b12e9a3a400---kofawumixekibusulelawowam.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192e5ba50e---xizivowudivupapifu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6rflgnmrrmmr4tns5jvqgkr7an/12399591751.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/3es86hupccnij80cuq04ehg7gp/xukanuvezizilipubonakig.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079faae58953---xipuguzizumojosepu.pdfIn PDF document text
    • http://clingac.com/d/files/relotatotesupuzukoduvaxok.pdfIn PDF document text
    • http://ud2-140.com/files/josevemosidewejutagi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7bb7c39f---34707139992.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/86302741179.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4d7f12f2---91815696388.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/64158108813.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/6986093386.pdfIn PDF document text
    • https://tsolisp.com/files/file/15614036526.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/77980954571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+much+do+online+medical+coding+classes+costPDF 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_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 17012 bytes
SHA-256: 0c0a1cfda2a65ce65c0a0c1d1739f87a60fab2e24bdc02fcf6b1fd781604d673
font_02_sfnt_off00014fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD8 10896 bytes
SHA-256: bc0c29d6806f697a89e111090842374b17f004b9007d995c074d1bf02157b732

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