Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0735a657b68796c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 17:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eff8307170878000a25040bdce971d5 SHA-1: 6fc7ad71320750df2181ccb011638fe2cced5850 SHA-256: e0735a657b68796ceb5f78982846630e3cdb57bc7f5e2c346cbf980d9977ffce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/399f6a0b2c7c594f622924ad83cb6536/wujefumufopupufabuwa.pdf In PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/togevugixedu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/433a5e46b7525c76eb83311710fec08e/tubimogizuvarunatezol.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/zitokiduwuj.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29686943584.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/j0ps9unnnkv4ritm8llhg6bv96/65408247371.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dasetu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a318ef6d50e---rimixijez.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/c1128e66a5383fdab7c6a9e4456abc72.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/93537047659.pdfIn PDF document text
    • https://frisch.ro/files/file/joneridi.pdfIn PDF document text
    • http://surestegc.org/documentos/file/gobubolemilitokivojakupow.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab1f28bb86---45151042897.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/purodofi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d949535030---17615985977.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/wurikuputimonezu.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/17175206713.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc6b9e8c5---xadute.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/73689081321.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070822d530b7---kuzozol.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad40dc1894---89885132309.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/88648210433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=k5+learning+reading+comprehension+worksheets+first+gradePDF 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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 16928 bytes
SHA-256: 5e7a00a562766c033587dc6ab6c4848ad4f7f78090cd2c8bfc333588f67cd38f
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 11372 bytes
SHA-256: fa27ca3775e11949fcf8436405a4cf59168a2e509428fc901a2679010faf91cb
font_02_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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