Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33ffe89233712d4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 03:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33e4d9de7bbc53da0ed80ffb1ebe181d SHA-1: 559911b450b60f5f4c9be9688726391221d6d946 SHA-256: b33ffe89233712d46ce69cdc7393f21290df45f74d49356407e122f08d8e4902
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or download further payloads. The PDF structure itself contains obfuscated data rather than readable content, reinforcing its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://vce34.ru/attachments/file/78832357398.pdf In PDF document text
    • https://foundryindia.org/userfiles/file/gisetagotulatuxedito.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f9a4e7bf3069094794fdd3585e8b195/45463963241.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebb3d84b4---72106850827.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/8e661e51e38c5affebe7677453d603fb/93393870925.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71a9e9ec5---wazegok.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/tifopuwiduniluferurusos.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3d90e484f57a20d9bc2b6d4b1fb3777e/xatawisovelemojivapatute.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/96262902682.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85582aaff0---remodijumolagexeki.pdfIn PDF document text
    • https://sealskinz.ru/files/file/4358535499.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/nunakubazidu.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/80671478924.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/40715075647.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/mogefajoji.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/wewusomobuxesuzudatu.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/xadodif.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608750a64e629---tugaxegefido.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/82088803027.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9ce72de14d309d9b603f2c04160bc7b9/80861467299.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0714f3583a---21263775291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=afrontamiento+concepto+pdfPDF 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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 10548 bytes
SHA-256: ffe05feebcf8049df9343bbdc725386e34159559ca65e4052ec5b711443c6120
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 18360 bytes
SHA-256: 87fa622b3f786a9acbe7a664680cf8920b0920943779ec60238fabf9f48cbd33
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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