Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8ceb2744039142…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 04:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 33c2cfb0cdb2744bed4c27096503fabb SHA-1: 416e79e5211a4b7d56ac94b73b45c6f0fb649a20 SHA-256: 1b8ceb2744039142f278b5b8073fc0575c840cfddadf7e8bb0757aed07e040a4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised CMS upload directories. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1092e91bf---tobejewusur.pdf In PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6b312034c7618376de0fa874e5358b7f/gelufotenanenubovoj.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/7301449341.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/28191976319.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c524242d19b---vipagewujarogedijitusew.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4606cac0175b3c7c692a160ce660cc45/84357181157.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7cb4899fcf62e157cfdd53a655320008/zefomenetejefuzoze.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/57435367942.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e67fe0aa160---38375416756.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8e2ed5b30---26835295302.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/60432252176.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m1rsooabqmc3vf12qae5pgehih/22117332063.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/97357039023.pdfIn PDF document text
    • http://klinok-saintp.ru/files/22129466783.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e5a6b15b2dca282b04f84a4a524e20a5/sewobuvenalogime.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/npo7264ual84m4ongb4v2lreo0/nibibon.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/368b9dd15933f9e2cd0da0b2d8259fff/48570588317.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/91413108303.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/87658574688.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df47e65e644---denofal.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/libusezisafetagutepudipuw.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/sawugonula.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/26726294140.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/67800804412.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/691971a0c8dae58a878404e746a17425/8962695008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=engenharia+gen%C3%A9tica+arnaldo+videira+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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 23052 bytes
SHA-256: 109f60c8783d67e37eaee8d485ad90ee6a219f4f7638774b609ee6a586a0b709
font_01_sfnt_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DA 10932 bytes
SHA-256: 5a7d90f450e6d0f9e9063f2b357035dd05eb85474751e8af53eaea3df6ea96f3

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