Malicious PDF — malware analysis report

Static analysis result for SHA-256 af221bf9e1063d1c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 04:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30314f277f174a7eaa0f47c3c49d32c3 SHA-1: 4aadc1737ba58a27974b1923bad8a6d0d6e53449 SHA-256: af221bf9e1063d1c0b01d5d2887d4f52757953a1fdcd62da7b3731223e01f481
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. This suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://johnmarzillier.com/ckfinder/userfiles/files/38817814328.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/55c8e78c18a0a1a5742a4719305dff04/13648063271.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/masoxifomujulomodez.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b167644d---32302033710.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/hi6pcjqosagmbp0tdm0t2r6qra/92022896028.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/83258980355.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076109da72a1---biwanufifunetaw.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/volusunobesegezor.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4f23d007167c82b9509faac192b42fb2/lipezi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161039b0c66136---motel.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc8b0e3d9---xitejujimovogusavutike.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf9e3a03ad---23060887419.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/71481882367.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/livufavuviwonoxak.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/90400167076.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/eip3ufgj3lgdagfssk9fvrisf2/28267725612.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5545326c0---93275548856.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/worenovexobopakisiru.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/93460083733.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/jagegexeposikovesur.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/541938bd15020e1af32b50f2575415b7/86979186052.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/21237160808.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908063257285419.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bidulotiweporitex.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/ragerazomijirerodetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fish+meal+preparation+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_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 18324 bytes
SHA-256: 7fc2d2a13c4475502e259426db9d588647d3529a8e07ce1c7b8555ec1d955a73
font_01_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 10740 bytes
SHA-256: d572cee2e711fe565f5997aee8330611746956c0cae53577ff07c44e25dafa13
font_02_sfnt_off00013408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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