Malicious PDF — malware analysis report

Static analysis result for SHA-256 24419ba5d963093a…

MALICIOUS

PDF

88.5 KB Created: 2021-07-07 23:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8bf5d3793dfde72e7e90c7da775bd7e2 SHA-1: 93428192206cd56b2359b7777da779d90c625334 SHA-256: 24419ba5d963093a0570b0122cdc87b199d2f95b7316299d8c4033459c083761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to phishing sites. The presence of 'utm_term' in one of the URLs suggests a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=suicide+squad+2016+watch+online+free PDF link annotation
    • http://kancelaria-perfect.pl/app/webroot/media/files/gemuzujugarerelibu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbd08d662---wajijudem.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/zexuzilomagagodowajubif.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/12622211296.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/86466343325.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a39ter6vh245f9odccpcob68i3/521158456.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/vudidarirerovalug.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/360ae84286be283bd524bde7ce2f9405/fupijotogaderemodikomud.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50442996487.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/361c3bcd0376953a3bf603245ba6e50b/94640894703.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/fejunoxibopuvozuba.pdfIn PDF document text
    • https://isleo.com/i_photos/file/56726739947.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wapikowexidibek.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/2tvjsvdcbt4s5vco2hmjp6v2g2/77343026848.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bcfa45bf7f1ae9f4048547b9d17635c9/61038038013.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4371f375f5a9249b5b23b1842337f774/fobefiwegewikologojate.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/62591326434.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/efae5d9d1043bfe7b06a0d232b384cd7/kuwopedokalusowefopexadar.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tazizudevofajalo.pdfIn PDF document text
    • http://kco.su/userfiles/file/libobejebevopixofikedam.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/jasavepozumosovuwefupat.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/38711622506.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/4tjb2vgvlri35qmp4hphmdnja3/wuwutemimekopamerijudurax.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/moxejegisuxosefekoxigod.pdfIn PDF document text
    • http://jinohair.com/upload/files/sapafad.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160738511e667e---nadanigipurevi.pdfIn PDF document text
    • 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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 11440 bytes
SHA-256: e9b744c3e2e5cb670a115e058a30947efe47d148af1fd1265d885876f5cc2e29
font_01_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 17932 bytes
SHA-256: c16517273bcf5d480b358a564c9940f8baf156cb6b068f2981711448523a8419