Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2da28038c4707b0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-23 08:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dfd2b791a363634b1fd254292c76735 SHA-1: 78d90498a1c79f43cf9a148829946551a6ce7dd3 SHA-256: c2da28038c4707b0829901de7e026e9751aa395fbd04aa7eb7caadea5eff4f49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains embedded JavaScript and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autoskola-scp.com/files/99296736477.pdf In PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/pezepi.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/83415781849.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/giwarufaxuxefovo.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/leruxipadefizapepenofe.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/89282805938.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/980584822.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144b0f1b0e98---dosesodotob.pdfIn PDF document text
    • http://ipllaser.in/uploads/98022613484.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/74011645796.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0e167502---jupojagivisevisawaram.pdfIn PDF document text
    • https://85097781.com/upload/files/68056075910.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/37528794001.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/21777227376.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/50799294326.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/mefiba.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/986226761.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/wonira.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d2fc1983ab073bd54e14089a082c19ab/24943267326.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/n204t945ajmdlhpjcma8556j20/30292029268.pdfIn PDF document text
    • http://ave-france.com/pics/files/tovesujoxodowadogu.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vusejisujewodixuginapu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/ninemanekifekaru.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/68925119443.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47807255981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+free+games+play+storePDF 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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 10672 bytes
SHA-256: 3a768e4653380ffb6a972ae31e691f255889ce49107bb6a8d1137af0c900baed
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 18328 bytes
SHA-256: 834bfcefb54f48cf64f4f6ef6ae0366a7e386ab19d700919f3e583c1d16778cd
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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