Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c3521b6bc6cde1…

MALICIOUS

PDF

88.9 KB Created: 2021-07-27 16:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84f3e249d1d03e9d020d9bcb3abbaf9a SHA-1: 08dc79e1ebbe0815f0a4aa844318f8c6f46af47e SHA-256: d7c3521b6bc6cde10a16b40bc4cad8543973d4d92164450f0e699689812b354f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the link farm behavior is sufficient to classify it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://autoprofi.ua/userfiles/file/92441002219.pdf In PDF document text
    • http://infunplastic.com/d/files/jelusuxipafenawezikebu.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/60067177021.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6b405846a6c4f928d57e4f79be73bd76/15314729598.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5554d815fcaaf58e83e80c411665ed80/16039381655.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b295c19597f---75108249610.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/gitelure.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/sejiwiluliluzawag.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/wabegurenitede.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/19504322569.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/11725850430.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/79971926734.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3c2bea8c---fitekodazo.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ff3d9cdaf---bikoxetixi.pdfIn PDF document text
    • https://flyags.com/editorResources/file///51262406234.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/97647569077.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/258a2fcb43f8e6efa4998f336e82c98d/98480532267.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/10443469452.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e339f469d14---13653633637.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/42961902838.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7lj4ahvlq3q1d4n4loimm8jm8/defabesumitedi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094434ead07d---40779831381.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/41060315954.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/fedotaviwewenogevuzujo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873e1c3ab6e---vuxezajibutifidibifena.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/bbf0efadef501d4e326c246efb7e3c4b/49347058121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=essentials+of+human+anatomy+and+physiology+laboratory+manual+7th+editionPDF 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_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 11332 bytes
SHA-256: d38b5d7c4938ba59b5761f3a8d8dba85519b0fa022eea91d877f126d65589fab
font_01_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 16004 bytes
SHA-256: 62e82604f8948f1f99f1a1a2142c17829cd8ad1adad5bd6c6e38ed326481a5b6