Malicious PDF — malware analysis report

Static analysis result for SHA-256 4356eac34aaadd5d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 22:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f20ca7f449b01e4d03f4b37015656fc SHA-1: 8767bc38814f353af05b11f2275177ef863933ec SHA-256: 4356eac34aaadd5df1bad566c79c1da701f84c1d4a0238474e8f1126bedaf99b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or download further payloads. The document body is heavily obfuscated, but the presence of JavaScript and the link farm heuristics strongly suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=file+explorer+app+android PDF link annotation
    • https://keluargamimpi2.com/contents/files/52308235165.pdfIn PDF document text
    • http://julianina.dk/upload/file/tasofevajigutagovetikela.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1eb526d9---43564500220.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/13872717861.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/10963293299.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/vutijorabe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161313b0a86104---virarejolagexubiwifunoni.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/91188843492.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/50119318761.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/45316718473.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/84420039430.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/79754376998.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/jomonigizimemisu.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/82480310641.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d13e4ba0fa6fd848349628efabfa3303/fisiwitugizuwaxodor.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/divepagutesugozumeletofe.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/97425142910.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/lipogavim.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/61283578550.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fb864578---kikimi.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/61531882981.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/dozokesofunonenabuteremi.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/58269035114.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/2001313147.pdfIn PDF document text
    • 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_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 10196 bytes
SHA-256: b13087b2e3e640229baf508289e130eccba339a04c6c170810199aaef95844fd
font_02_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 17464 bytes
SHA-256: b160fdcf2bfeb9d3c28f7c9add030edcbbe62ff884acd334feb0ef141f2aeb21

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