Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da2ce8419663306…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 03:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b15ce4acf4a2ddb1dbd730575e779835 SHA-1: 8c07bdd2789d788a17a7ed44b4b5526347b6e9f7 SHA-256: 5da2ce84196633065a167522e36fc7dd61764836cf52a026ba3a064fcf3d712b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it contains numerous links to external, potentially compromised websites. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern involves directing users to these external URLs, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=protamina+dosis+pdf PDF link annotation
    • http://bostonmentors.com/userfiles/file/suzoxotitifozutevadadapob.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/69300587439.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/76576023201.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160716fc6545bf---zovevi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e032724219a30cf86218134c3d52608b/55040750709.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/97138216715.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2d3bc41de6109e3f5c29ceef86e476e1/14916990533.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/14103606266.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df3aacd6e---vepiran.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/4546239079.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/37611970920.pdfIn PDF document text
    • https://netlandschool.cl/files/64335323937.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/28078551560.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1e09ce84ae9f82d84a20c5e97b5123e7/39625794879.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4f4u57jaq0dvrpfqhqpr4v0210/5373231519.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/wadoje.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/reladebase.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/91b078e070acae5fda98bc2618ef112d/xuzelokubiseguxofox.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210708_09C2D82F3EC0CF67.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/37977405650.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/53678562694.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8279ca83---73585568373.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc4851c8c0---jidagupo.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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10484 bytes
SHA-256: fa145b501a4288c035a796b260b307b82fc9aa5efc1bf0b9851842274abb1574
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 18256 bytes
SHA-256: 646fbbdb05b94e35605f724719062f6d6f45f6dd9033706397d5dfd81b48bf59
font_02_sfnt_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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