Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b2310f110642df…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 21:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 252874f8bac60601fe5cf3339f1e6ea0 SHA-1: 9885fec807db17d2099fca4c07e460be7cd27973 SHA-256: 77b2310f110642df670df8c8176f9705e1b894f2d2882ecd5cb00abf4d03034b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The embedded URLs and link farm structure indicate an attempt to lure users to external sites, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l9uamt7rk4josvjk7gp51f5qka/46463742810.pdf In PDF document text
    • http://briarcliff70.com/clients/874901/File/18563263272.pdfIn PDF document text
    • http://ndt-ultratech.com/files/51430244221.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/63f39bf37d7185c344261421208b7802/83873658243.pdfIn PDF document text
    • http://jar-ted.pl/file/55173414828.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/72187732995.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4fe56c205---49387840149.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607016471682c---sajofewunevadetajopim.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a20d33a862551f83da391013527028bc/pazovifoz.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/6105497956.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/1b891bd4fade657696228adb79d47e33/gadenimadikizagevajip.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e11411862---rawaresilefag.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/157e53bf0c54223c4a4c25acb64af723/8174148556.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/vodotunatibukipovekosajuv.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/7859905104.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210724135102_66dxga.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4b070e3cde644f5de722e544ffae05cd/74645457393.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/63792958552.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217d8bd3a6---40060387295.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/vusopukavonizu.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/18793744485.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/26034649663.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/jepinofiku.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbac876675---pudazelobedox.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9440f37ac---wukik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=weight+watchers+recipe+pdfPDF 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_off0000babc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABC 10708 bytes
SHA-256: 3d4da24409f3f902befa5444db77106f71e9b4a73b7aaae5de51d4dda43544cb
font_01_sfnt_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 15072 bytes
SHA-256: 19b5c9667a98fb3e0587ba8a7b552a10e44d0f1f152d86a7cd84126627ddfd09