Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff0d77fd7def62d…

MALICIOUS

PDF

94.9 KB Created: 2021-09-05 21:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49fb8b72f1f8db7e6fccc928d46e636d SHA-1: 9af9769f29a250e05f9057ecda465b0e4930cb93 SHA-256: fff0d77fd7def62dbde8d68727d3e6feec80f063057903551ac30246cc307e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://studiotecnicomartani.eu/userfiles/files/39285894919.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/dd2758eb7bce8394aa28bc092e220c8d/puxalobolubax.pdfIn PDF document text
    • http://aweibel.com/Photo/file/ganaxobajovanegatevan.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/blsmi87lm0f49285qkednoi2na/tamemun.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bffa675fee3---tavago.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cec759cdf18d9ec341048339c97cc3ae/pabobirepefumutor.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/49549147187.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/goxufepuxur.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/13607970816.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/10844614306.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b0c632a64ea652e2001db72d4c348b9c/xasoka.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c4081366e---46045754006.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e931e0446cc---70617009510.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/rekapa.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/14746251276.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/22ed9ab5da26c6c4aa58b260498a359f/vojofefebipo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b233eff1d---sozavuzufafenotovelori.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/xadisopugefenefogepifijo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ofrjh9d915dhjg5ttb20v336qi/jomitame.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/37250551890.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/42682847386.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/97310100367.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef6a660645---suvimowelelizopigilone.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087f11f7c49c---29378875868.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/wuvegubufajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=menschen+a2+2+arbeitsbuch+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 25416 bytes
SHA-256: b0d2da7a26cc0795449e51fab4d8243eb7ece29c04778404fe67e93ed14c8189
font_02_sfnt_off000139c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 11156 bytes
SHA-256: 3ede719684820cc420e47e756398a5b8639a0f7743be34565a22a44688b1c497
font_03_sfnt_off000153aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AA 17072 bytes
SHA-256: 1b581929c7f414b3f0ee11f39dc399735273185fe285e065a5cf504ee66a9539