Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb57b6da4776fa96…

MALICIOUS

PDF

102.8 KB Created: 2021-09-05 11:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c6babe448ba883133a29586c6babd2e8 SHA-1: 193392f1e7e89c02a37d7b103611a3b0c7eb8255 SHA-256: fb57b6da4776fa96fa6942c90b6e1ffdd4703c1d48c2fdf40e09df828e28c6e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of multiple suspicious URLs suggests the document's primary purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://allytemp.ru/uplcv?utm_term=lgbt+research+paper+thesis+pdf PDF link annotation
    • http://kingsfinancialconsulting.com/userfiles/file/70526932588.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/62b5f94861ce66909a410fd40cad82af/zotazirofeguruvi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a518d6a7608---31767691815.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/99215345423.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/59874071894.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd08fe22de---3522775062.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/21436682dc637a7c276dea5679ecdbda/56805465105.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/93211266174.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/voreraxezinotumu.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/zokavowip.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///83747387922.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/41330778257.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/tozaxedinen.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/a439dd15fe58bafbe61d25af33f02445/44332524826.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/pelafamamakizetexatizifet.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/lafopijumiwu.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/vuzeluli.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c93fe0752ff5ae884ff819c2b5d3017f/vapoputapubebu.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/barukezonigakanuk.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/46082819491.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/29123703191.pdfIn PDF document text
    • http://skisun.it/userfiles/files/82047296922.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/wafinenejijulavusij.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/gogufu.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/412696e9b448237fcc1859df1b31f419/54410874129.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 17752 bytes
SHA-256: 0e01ac776f7ba742acdc2895b7b221c807a1337071850c2409f2348cc789b619
font_01_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 10728 bytes
SHA-256: a07028097684d03fecdf8d69222d445e260a6b373970f9d9e88e1c6d55f23aab
font_03_sfnt_off00015d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8B 18148 bytes
SHA-256: 120115f40562eab8e2667308db0dbe89c0a8bb271c63ba64afef226aa5e8b0aa

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