Malicious PDF — malware analysis report

Static analysis result for SHA-256 a495bd78e5da6b29…

MALICIOUS

PDF

95.2 KB Created: 2021-07-29 10:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70d1849c4bbb92c1352abc77ae6bf255 SHA-1: a522c1f3c3faad452040bb47f9bf469861b52181 SHA-256: a495bd78e5da6b298ebf89ebdef5737fe437141e58f8a4f0be22d0a63affdbef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to host or distribute malicious files. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13878dff2---kazuximokifogofisid.pdf In PDF document text
    • http://guitarenko.fr/img/files/sudanitikabitade.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1808457860e060d00ea76.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/838b025be988b4349996a5c9288a2a2a/79226782598.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/9d7ef18ddfe539acfa9216adeb529950/linodisik.pdfIn PDF document text
    • http://cutskytools.com/d/files/25560064302.pdfIn PDF document text
    • http://kotolantopeni.cz/file/48303612255.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094262ccc82f---35671016887.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/texibog.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f468d833a---43733078478.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/41620980257.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/28229308904.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cbef36b9f4d041c8702267f3697bbb61/gaxuvidarasabila.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/3e2d453c20128404ecd774efb5be750b/97190197939.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcedc49614---vuvurivewazaja.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/90307259975.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/11e6225b8dfbae8ab0baaea603692e87/tolexofanigisidofesuku.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pt0o3em1s5qgtq1qj1p8eiukc0/22252805548.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/masosomupigipi.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051003172823.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/88834540952.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd52f1bda---90838272062.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/11460218552.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a418b7b4afb---71637049400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+parking+simulator+pcPDF 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_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 17052 bytes
SHA-256: 9bcc9f8e628fe9d94f56001249239c3eb882ae6d557ecd3507d4035bb4847bb5
font_01_sfnt_off00013c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C73 10964 bytes
SHA-256: 711a703f3763accccf73549aee4560afadb2c60ad50b8771ae2fee546c28849a
font_02_sfnt_off000155f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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