Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3783d55dd618202…

MALICIOUS

PDF

86.0 KB Created: 2021-08-12 13:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2195ae50e47ad152d67377053a9f85a1 SHA-1: dbb741313f618962e9fe9d51d33195620c2ceff5 SHA-256: b3783d55dd6182026b7aab15cc2b51c983950e11abdc5b3f492ee45689eb6899
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. It contains numerous embedded URLs pointing to compromised websites, indicating a likely attempt to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and link farms suggests a broad distribution or obfuscation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/uplcv?utm_term=balanceo+de+ecuaciones+quimicas+con+el+metodo+de+tanteo PDF link annotation
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/zibilagifa.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ca06a433f8df18d33d7dfb26058bb44/gojolovamujel.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161048f10c98e2---mofegumurigepogok.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/43849225789.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b6e736a43---jubesesutulut.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfef83648---86353587542.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/dukexefilufuzukivisataf.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/92749743486.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/zubilikesonomarokixewavit.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/jidun.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6ss91d98oqidc4ajlfori9s78h/giwuzisoxeboludegunem.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/16725919067.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f04c05297---fikigoro.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/53edcbb5add88594eab0bf350c3df0d4/subugenedenavofawe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4a26ac24---wivetazenovibiwa.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tbmhvlmdbqid12fvvs6vpoksqp/34486267085.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/57307680437.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c27d50c9e8c65094728aba1195a36ba6/xuwosuzenovazironela.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/07f6c6ea2b6f9de527ccb7ff4539e5eb/11005679742.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/55802846712.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fdb43278d180ef738cc1c4aae5dc7614/31446059281.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 10732 bytes
SHA-256: 4ced6b41e815f1527141118a6e0d2637cebdf85705655cabf197374ff29d0a54
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 19020 bytes
SHA-256: da95ae233a91075d271125a8a34885ab3d8335b31f4bbe3de26607bf305617c5

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