Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f03fae962616590…

MALICIOUS

PDF

80.7 KB Created: 2021-07-07 15:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62b659fb96f6d3901bd9e5916f114b23 SHA-1: 434d88f55726d889b7c1353ce09dff2b7fbbc84b SHA-256: 8f03fae9626165909e9d7aead045ab6a2abaa3e96df9043aaa18c5a6d993ce7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://x04ydivan.ru/userfiles/file/23835929705.pdf In PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/lelijuvuzamadob.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/matug.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ff477b3f8---97689187719.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d3430515---bijimepozerib.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/zipovenudilitowezadotoli.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/89433370437.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3a309d1a---gepoxebabimozi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/soxev.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/mikosewenumoloxipiniwu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bosukidilewijekorigatulaf.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/37422875104.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a4205d03eb5---62391308223.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sixifolusox.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/majizisojedukawetifaxe.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae29217b6b---20174439051.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zasixutaputogufexatubezuk.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/7638993617.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b157533a---59756768190.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/51254416715.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/da98db67e7c98929b897f4d366ac39de/donemegevoruberogibekar.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/21392248171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=potbelly+pigs+for+adoption+near+mePDF 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 11096 bytes
SHA-256: 848aded22478c65e02a31758b54e9676177458ac1b0d6ff0ee7a37dca65d6400
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 17384 bytes
SHA-256: 525ba82cace7adb2fa8a838ef7c334f81422bef18d84ba58a298c1322b827170
font_02_sfnt_off00011b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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