Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c4a8a3ddd704fa…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 09:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e1e826dbe19c5fa278e9df598377ca1 SHA-1: 9e2386b59bf11fee0bb52187251535841a4dd45d SHA-256: 42c4a8a3ddd704fa3c240b6cbcfbab4243e36b4e05955d520e40545ec8b67f57
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=silhouette+theme+song PDF link annotation
    • http://brkvinc.com/userfiles/file/putakezidiritexok.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/rutelesux.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/69742957645.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f15d241f37d5994064988e843e37ff6e/jimusepajexitosomina.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8aaafc98cd47f664935da3ef757c8001/furatejapinip.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/34013848635.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/wesufeva.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b153d7173ca---1545873015.pdfIn PDF document text
    • http://yilip.net/userData/board/file/famajun.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/13678469513.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080245fc0d85---xebagatowalepiveru.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5aed91b95---fowura.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/3151997488.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ce5dd5a05---58478597113.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/nujukebefajatilaxobil.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/98940306471.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ucll661604l0atpm03s6oelbp8/degobuvew.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ems7rgrq6d6ftlt02uifgksbli/22052663999.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6adaeda849758d80c74ffdf487e72303/tijufim.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/pimalufutonu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7176f1828---xolijuxoga.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/wiluz.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9aa513dd---rinelukedixuredeluxunas.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_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 10468 bytes
SHA-256: 508e63913ceaf147a854933cab55be8851d8163ee1e90380b0b24b2d09d7cdf1
font_01_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 17012 bytes
SHA-256: 555a2797168aef334d5f0484ec863a7df474523657427221d611af4821f494d5
font_02_sfnt_off00013572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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