Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af2536756f72143…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 10:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba269682cf0aa0dadfc0c07d2dfd778f SHA-1: f1fd82ec0ac569fd8bf409e2d006ee3cb8180de6 SHA-256: 5af2536756f7214370b5b1ad4d7fb521ba6b35ce0ce91fea68c2889ca8638b85
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other disposable hosting domains. The embedded URLs, such as https://krisoc.ru/uplcv?utm_term=enoch+adeboye+biography+pdf, likely serve as redirects to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://krisoc.ru/uplcv?utm_term=enoch+adeboye+biography+pdf PDF link annotation
    • http://russia-ex.com/zolonedesetoliwonusukij.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/bibalimobufenukub.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/92144121568.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/60796020685.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/didcjlj8426r1ilhbn0u0s92v7/konogebosabibudij.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mp76t7gtpkiii8r5mm2npje7k0/wivarawulurarufovozus.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/mituduvetusafexirop.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/73079541799.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fb12aa21e97---wudaruwuzefokokifogebefu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dfe111457a9ac04452d538dc793c08c7/72907678301.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/c33432d7652b9d64ecdb877c4ae72bfa/ganob.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608adb4f80795---72160999921.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/p6av4us7n3a365l8rrebh3ni70/94101339563.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/lixisewisakaz.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0550873a3f---89423880221.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/bbda6591a46d209f014eccb35bd89286/xavinipuxepiwetibumi.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/n08ihatlp3qmbkabktqpjfa041/dujijozesobukugew.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/wizuraganaxukozeze.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/eb754bcb906e584e239d0f7981e81f36/53482191155.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/novivigefewo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3fae81b1692ee94c1a3589482bad79a7/25757650496.pdfIn PDF document text
    • https://senhewood.com/d/files/diripaxevidilakogi.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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 16872 bytes
SHA-256: f9d7ab9416fbcbf395dddfa991e74e28348c74c8a896c2285d404e41d09a2c25
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 10824 bytes
SHA-256: 07917409c15741fd0a3b50882cf4e5bc00be5aabf6249620278c29844ead6f72

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