Malicious PDF — malware analysis report

Static analysis result for SHA-256 255e1e714ea3514d…

MALICIOUS

PDF

107.8 KB Created: 2021-07-03 21:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c1416b3bde201e59a647d699d91d38d SHA-1: 3c4c880c516f281b12380e6bb3492dbf75a28aa1 SHA-256: 255e1e714ea3514dced7521b0bf700ebf8cc53b96d0ef7930b792a9b5b918a3c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is used as a lure to redirect users to potentially harmful content. The presence of multiple external URIs and link farm heuristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://laborke.ru/uplcv?utm_term=the+solubility+of+iodine+in+water+is+greatly+increased+by PDF link annotation
    • http://circuitoinsulargc.com/documentos/file/55007650332.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21ece491a---87529520489.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a29990f9---dofosoduweponivaniv.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/69120225319.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb370e62be8---rizugogaponagatikej.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621630737.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846ec50085b---96186289781.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/1dd8a2cforjcd599q2kuko3qp3/46563633843.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d380d555b93b8c9e0ff08811468575ea/lanuri.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1898024f9---dusofulorowajarerotarinut.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/r5b0ik4ti4msof7tj69jar20se/73975844739.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210702_8D74A2D5B4FB753E.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d568168582---19421736393.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t3svv23j7vqgh58u66fv45b85j/kizulupuvimux.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6hatli1pqh32oa0josdvdlshdp/lukosigatejaj.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bedd8114da---19324042071.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/12076001775.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5df3b079e29cf8135e7c1dac1551e7f/89241035539.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/igckclsti6dm62iumc2fjcfcj8/datoxijavagetogimulinuk.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/77477353348.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdea76f3bf---durorizavarominakeval.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210627120758.pdfIn PDF document text
    • http://yjccnc.com/upload/files/87880097595.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/db785c5864529217b98d9d59c1c9e645/muratu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/js6u5ktgi38eiv6fl6f8311qti/wanitujoxo.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_off00013f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6B 18160 bytes
SHA-256: 0fd90eaaebf177242a82375d829553d32f5ce811146a2d11132a6aaf4bbcb6f1
font_01_sfnt_off00016f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001873c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873C 11156 bytes
SHA-256: afd657e272d9a43779858d93214ebb5740425d02da89b3a69772d976f6433a90

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