Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f431715e828bd5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 00:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cca6fec944a71b170597273adda7b2a SHA-1: 856ccd16dbf67c3e9abc6634e88e0c7ad1e3b333 SHA-256: a6f431715e828bd5eba23dbae1bb77c368aba294ffae099ca5d00172d28560af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable, but the presence of many external links suggests a redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://langeline.com/ckeditor/upload/files/fagezifimurejarepazek.pdf In PDF document text
    • http://pk.mo/userfiles/file/74278068938.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210906_200237.pdfIn PDF document text
    • https://botroul.be/uploads/pasokesinagapuxofajugose.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nokaxalaniralelofezapafo.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/gonesudu.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/wugoxirakapuromerejelagox.pdfIn PDF document text
    • https://akemi.ro/hirek/file/27247803075.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/lokajidujomonipiboku.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/75551401060.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pozuwogotobu.pdfIn PDF document text
    • https://sadex.pl/fck/file/27945682493.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210907121247983089alv7a7o1buag.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/72682484740.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/82098388277.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/wegijisawezowikizininuvav.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/momejulatokufusek.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/62736946119.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313992500e5---zajuzalisutiwarudezikowiv.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091305053673499.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b58b907d---dapivubo.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/94822160163.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/wiwagusixoranelojuwudo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18ff3594f---10176140215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=baseball+games+unblocked+no+flashPDF 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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 17068 bytes
SHA-256: 87ae561b19427ac2970be8b4a8e142f8784522e99aa45c1cf8a75aed8764e715
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 11020 bytes
SHA-256: 5945b49669545ad47699d7c7436297d4f48954391883b04cc4ceb1a4332a8893
font_02_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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