Malicious PDF — malware analysis report

Static analysis result for SHA-256 957d28ad1b49af9d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-07 06:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd9658ddcd7268e1028eaa4c6197c095 SHA-1: c99d2c979a8dbf147a9e42ab17b85eae11542aa3 SHA-256: 957d28ad1b49af9dcf44e894ab8c5c8d0f93970d9acf453d617da3d6a1913aeb
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the presence of numerous external links indicates a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://biothiennam.com/media/ftp/file/39315451085.pdf In PDF document text
    • http://cafesezony.ru/fck_editor_files/files/vobitokodamegitap.pdfIn PDF document text
    • http://rotang.net/userfiles/file/semunenetax.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097e778746db---3062691910.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47d96c03ed---52194392969.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/52537654326.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098825ed70fc---85425608612.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/kfjbiekikei93244cssuqlpkun/jobibanixiga.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f888fc39e9---34071342753.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6119791ee---gomedunajibawu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e319f28547---87374325875.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/de03e346a00aa40de5b26ab013a15c75/vigakakekuzuwakaxe.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/tofiluzuxogokawide.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a384f1144b6---20721727682.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/guvobepixivubobideleduput.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87e7232be8---vaxejubomux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b21ba0be60d---kotenipateruvidim.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/06179b4e4f31426f199762165d530713/lukirufam.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/29239187444.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/fakebudurikisefi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607938ca5a672---dodaxaxutuzom.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/210d95ed5a0f9c8e61bcdd292c34ff05/71545578588.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1ff4ca30---pupituz.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidutuvifajupubopudopaxof.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/xezupalow.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/firowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=alvin+and+the+chipmunks+80s+episodesPDF 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_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 17508 bytes
SHA-256: 94b7ba6e2981eb3c0ea830122ec429b171ed3cf011d2657ef1989590964eaa9f
font_01_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 11248 bytes
SHA-256: 8e814c9bb82257e98c67b127696bfbdf831ad9cc6f59956a17b7f42ddd8825ef
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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