Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ef7108cdae9c2c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 07:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb47f2916642943b36ad2498ba7abbb1 SHA-1: 3405281088a348acc2fb804d1c0aeb2f48a787c4 SHA-256: d5ef7108cdae9c2c96f079a30fc67bf0b8e7a09326f3204ebffcd01ee15082d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it may leverage embedded JavaScript or exploit PDF vulnerabilities to facilitate downloads or phishing attempts.

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://wedding-box100.com/uploads/files/202109091920219029.pdf In PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jalevi.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/74933449016.pdfIn PDF document text
    • http://llux.vn/uploads/files/jonabiwomam.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/75316816249.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385caba71b0---fasumalem.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6c37a13b---domegolirazorukupona.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vevifiriperemikafavabuxu.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/70895795253.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/54824086339.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5slk8hdluhpu03re1novihff8b/5300741149.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/jeradeweber.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/45774bec7c833f82903cdb6fd6cc9a94/47030707039.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/zukividibepokilaramix.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/rasurekomepefoda.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/62521437750.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/2109060532097274897o7869wsfdyh.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/99091368211.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109090008588264.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vodudasedafesotilufor.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ji6ediecvu6u7jc917l347jk24/14200691739.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/41335557619.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jujapafiluxi.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/toladogid.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05b26c4e7---91288811020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=modern+combat+sandstorm+apk+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 19164 bytes
SHA-256: b31b48f91e915e19bcd664100518e598947bfd530fbf0342eaee9a3020b56ed3
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10896 bytes
SHA-256: 41d8d647bca4a9ee47accc13f16e6214582a1fa67581c95afc4660b762dfeaf9

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