Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc8d4310ef69162…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 22:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7adbea837f8044668433603ff9a9ae7b SHA-1: 0257dfa48eb5b7c82c63580191d37b7d90be7010 SHA-256: 0bc8d4310ef69162436c548ea0fdf1c4d688cd2fdb7e0312fba395c9e0e03944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=poetic+devices+used+in+a+thing+of+beauty PDF link annotation
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//73222000413.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/68qj3onlcv4fp56883len7fek3/fugofebatatixotomi.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/s8v1p452lfabqg03h3nbml4hn5/18225567242.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/puvilu.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ni6vdhvhuc0n5imov7j70uuudm/3057345072.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba3fdcb67e---49460762417.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8dd43c0ac8419db6caf5aba1a3de8780/xomafikon.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac735f3aef---wafumumoxarozomovelo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/91473520870.pdfIn PDF document text
    • http://erex.hu/upload/file/97602148131.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/46f81vfh90j3u9fe3j60lekoa5/vabefij.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a80da4b02804a2e983d47eed1cee22a8/xepobabimijifew.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/26939636664.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/bofupopavepix.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/ravamiwibowizalono.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160886a5c22350---jopanupu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0a7mp2mbrl8spsi6pk47p5nc1b/8017025289.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e3e258da38f0e99b191bddf1ab4e7542/86463442804.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941a1365cae---tenebejo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/le4q0q488pgu0oftacfd5l6io2/16619724998.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/p1937pag5lr3gkgcbq0brpgr50/21731423685.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4a870479fe14bfe4e1430c76cedbf70b/63743103261.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b5c9c8613---fowelebudasiwuwugidev.pdfIn PDF document text
    • https://nevisnews.com/userfiles/xotafavuxofatisolizumefug.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/vai8cah7ojnb20sc2qhd16ntl6/21642059741.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_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 17456 bytes
SHA-256: 2a7d9ba367c45f801a9f4b5ac430b0ac2293ec06adb3024491d98e1c28e3a00c
font_01_sfnt_off00012e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E18 11028 bytes
SHA-256: 0a327f446689e112bd630f1a06d590a242aa3a3265bf8ed38e0e863c245f058a
font_02_sfnt_off00014793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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