Malicious PDF — malware analysis report

Static analysis result for SHA-256 06113bc39d09ac02…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 14:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c64fb00df654ba61e02f4b06d66a4c6 SHA-1: a43cb3e3205e863016e5ce3a146d8190df8bca97 SHA-256: 06113bc39d09ac029ae0b4527382ece6f6accdb53901d7b63ce824539fb2ca31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fkn43rhmasr29qtr2vtml984ej/vezinabawexezoxoxobo.pdf In PDF document text
    • https://sowlindia.com/userfiles/file/89431210726.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/wukidikerenejigidadatuga.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jogivisexefes.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gegonokim.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/xigagubajifesi.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/34133537507.pdfIn PDF document text
    • http://12shio5.com/contents/files/kekolelumuxapidixewoles.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/75802405042.pdfIn PDF document text
    • http://learningkey.org/userfiles/roronolasuxawusu.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/tusadijoposakomi.pdfIn PDF document text
    • https://tckontrola.hr/files/watubirajupive.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9d7c5487787308e1cd9d681006b9e8af/62004484308.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/47187110453.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/485640712.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/dijetaso.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/02be17b16d4e303a2c07f10b738a5b3c/jamakoxuxufixumorenujo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/52593619897.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///80767565823.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/xafodatefefolojuzifidaxu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16143f7310d600---zupobu.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/lavorunadagigididow.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210919_010255.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/kakide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=which+is+the+best+app+for+photo+editing+in+androidPDF 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10988 bytes
SHA-256: 45e76ad5b3d257aae014674ddb9651dc48691f9eca928ebe0baa9ccb34d013c8
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 16628 bytes
SHA-256: 57f4e9017122c4da4f2932f1e4f8996a465ec566c62e785e984c66ec4ffc6970

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