Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc5e425bd0024a8…

MALICIOUS

PDF

76.6 KB Created: 2021-08-10 03:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6decebcbe91b53748efe1b727589fab SHA-1: 8b774ea6b6f0d8c67050669c054f89d017a32ef4 SHA-256: 2cc5e425bd0024a84845073417aa60dbf34de06223aa030be017c27e1da6252d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to exploit vulnerabilities or deliver further malicious content, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://rebizplus.com/userfiles/file/ludojedazilarolo.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/eb8153ab8f17bfa136ca0b75c6a1651a/29050703232.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bafd9584c---bobufefa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a74390a12aa2ab566afdc15ba11625e7/73652238613.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/zijanokuzujutawezulimewon.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/75737997487.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/60766173866.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/afd8635c869e2bfe0954e2516a25d25f/budaporo.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/xaromiwemage.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abed21b3deb---60215781077.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021072805264883.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2e58855f364cdc3dc58b9a7ccd556ba0/25890868373.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/fejix.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/toxisogodekufebutem.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/sutaguropazigugixalum.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ruvijo.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/11966002806.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8b91a1bf---86213771821.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/52e78ce3da8a5af2fac27c6e400d527a/saxuwulalediji.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/28505256375.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/saxuzomop.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5197e9c47c---80194655204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=beowulf+chapter+questions+and+answersPDF 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_off0000c900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC900 11104 bytes
SHA-256: 7c61d6069be4d77e4a33333864f6c16211f8efe05dd7e1e7d9b9f43fe138089f
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 16092 bytes
SHA-256: 7bd167b10d22e5b36fa88a89863cf871ae583096fa6fe8ba41c849e869312937
font_02_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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