Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d67e08b4839832…

MALICIOUS

PDF

88.8 KB Created: 2021-07-04 03:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4eacac92070ac052c90b43193f7220cf SHA-1: ab7c05be3fde175b5c10b4f17192d8ce0e7e7508 SHA-256: 06d67e08b48398320e6fd0f736b6c9754fc5435d10345e5ed5276b17e61c52f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution. The file's structure and embedded URLs suggest it's part of a campaign to exploit user trust through compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://inwebjor.ru/uplcv?utm_term=clam+chowder+with+crab+meat PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8bff24690b2529be0084b0cb99e6da32/xusipofepakasapuwoleler.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4821bcc89---paxisapowoxewuwozegib.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607459881b032---porojinujorevuni.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5515c8cc---59664492026.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/fdhlsaenlkt48lnfngh7t24imi/xidowijatujito.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609277aabe22e---viwutenuru.pdfIn PDF document text
    • http://primaneighbors.com/userimages/tadapar.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/pakakibulisimi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297216160---jirapinotabipevorud.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92907e1cf2---6618766770.pdfIn PDF document text
    • http://clingac.com/d/files/62930260259.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5d6ca82e---kesudeneropifamusasu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c224b3d9c258503002234bf6bd5f8b55/32712913163.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f449eadbe---sujogifadutazilipulug.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090a343ba5ac---sawojufipojegig.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fagerubidepupokemikisigiw.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/57669455225.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdbcee938c---papesumojukuvekituz.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69d1261a11---15734776274.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/28336050512.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/walefevavozefoj.pdfIn PDF document text
    • https://0900107678.com/upload/file/34380001538.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e0bdebd71226d560a86e768e0987171c/5778453576.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/72849710025.pdfIn PDF document text
    • https://pmms-online.com/assets/file/78626431837.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/zigafefo.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_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 10620 bytes
SHA-256: 3a8d3295b1733a759feb7c87c951202265e3fd210d4a4e72524daee0ed8c4059
font_02_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 18052 bytes
SHA-256: 045a0f137571a0ce5991ac1446e83100cdcce76fcefd2735f68e77713c8c0277