Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e51f1a35a1d193…

MALICIOUS

PDF

89.0 KB Created: 2021-07-26 03:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77f925e5bfba32b2c0625d1391dfe4bf SHA-1: 707ddc0fd026286c5384ef944c0ebd611eaccc00 SHA-256: d1e51f1a35a1d1934c579e736a394385abe3386cf68399e5393a7a5bbf467361
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised CMS upload directories, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or lead users to phishing sites. No scripts were extracted, but the structure and URL findings point to a malicious document designed to trick users into downloading or visiting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://birnagarcollege.in/userfiles/file/48081201330.pdf In PDF document text
    • http://ingenermarket.ru/userfiles/49796546103.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b18bb3d5c---75428736089.pdfIn PDF document text
    • https://olterus.com/contents//files/91562644929.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/dcfb47d4fa699da3cca53bce6cac6288/43844326829.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/77182268714.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/22/nedomeximu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/7f7f92972b2431b5322d1be13f3b0572/77929734399.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ca08263516b413f24c9f38c2f98528d/tadujelufanab.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/70946091816.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/e3ea127b3125611fc0e09ebf4736e9f4/10405499384.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0cbsdnt4kj2anvs2pt8cspslq9/xegemobewekinasuvibuno.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4abca86ee---janelulipexavokojopugor.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jonodaliwonibeful.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/51601102271.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8oua3kg0pcuukmgsjgbcbu2874/tosoxeripitafejogaso.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/55962910089.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aee7ac793---sakodugasomabevelebilufub.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/51b9bf3ee102d95dd221844ade5739dd/85316700072.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/fakuxuzoxazifesimowi.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/80797545851.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4137584915---gebijakebuma.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609acc3583833---40583957612.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3d61593e3ae7a9c0724b4490c7526f0/78210984075.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c30639f2b92---56958737880.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb3e8ea50---risefodejizali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=plant+physiology+and+development+6th+edition+pdf+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_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 16976 bytes
SHA-256: fc88f9955d3284aafca43d799f697593affcd5e96fd5f25bbd930c1e54c9b4b8
font_01_sfnt_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 11280 bytes
SHA-256: 2461948f84b56c8a9f7e7672cb9d8e877783f319f27ca1380f9f1efda6a8cb06
font_02_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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