Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41705ed94bda3f1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 15:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc7a1ea9d32502e7b7d26d94c75afe99 SHA-1: bac1e14a1e917dd75f8ab2450075d71c2b4e2370 SHA-256: c41705ed94bda3f1dda4c0267e43fb61a79d57ccd3790e08d3c2904f315f201e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms points to a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://rdsdealers.com/ckfinder/userfiles/files/musokakonererutopej.pdf In PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/zubosatofelikesoxa.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607084e957ad4---kapajuleborok.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/219fd2e4b61c45c15081800889df774f/kowur.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/lazutuxufa.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/xinujozirurefipogov.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/11447158813.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/9727549559.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed39aad1e6---mokokawonerodiwesasegu.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/jipogusozebop.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde497a57a---16330766323.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vixabeweluxoputafor.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47ac6f3b1d---kegetezenujezasalunu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ce5766b7---vawugasibiper.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610365832385c---fisinegebifuvonobelema.pdfIn PDF document text
    • http://kasargod.net/uploads/file/33318668726.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/bawetilogelemamepixofuk.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210710110158.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/72217409098.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/8816609479.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/jewujiwuxemer.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/lr8iuer4mfo3e2f8i1uqkfmtum/jagulovovanibetogega.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/237275580.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/24721f1f4409e1d59b65f6fb3db208a6/87908099446.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7s8kdh0mevfnfgj8m2r535tvpn/nekovubituponumutiropij.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gasoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=eat+right+for+your+blood+type+o+food+list+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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 17108 bytes
SHA-256: 1d66299a440166f8d9fe71c2d42b9476a1c159a860291e7832800c1924a797cb
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 11008 bytes
SHA-256: 17e317e0c2bcf67fad59a1735243d78bf40d81cfda8af6de990809d59534d05b

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