Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fce9c81c93cd11…

MALICIOUS

PDF

79.8 KB Created: 2021-06-30 03:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 594ac2dd7f7355946fd8075ad83f84ff SHA-1: fbb3e16ec6ba456cf505dadb11699e791a5bb086 SHA-256: a9fce9c81c93cd11cd711f6fc7fe2f870498075cbeb2ecba19b976f7b2c3ff91
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous websites, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://agnieszkapawlik.com/userfiles/file/47824757079.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/satasaguvelowetu.pdf
    • http://aarogyamedico.com/userfiles/file/28851375433.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83f889615---jemododowogoguwusaxotos.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf5179e81---fegerufovujeb.pdf
    • http://alibabashipping.com/userfiles/file/vetopofufoxugemuzaxizafip.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aadf79bc3a---mosepazekepi.pdf
    • http://scheiden-maassluis.nl/uploads//file/36578207177.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/11151642928.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ir5or7854nbdup7qql0qlav2l1/lalowibasif.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ec1dc305---15060836927.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/xasapi.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f2553f53---renugulir.pdf
    • http://tubietelbar.hu/uploadfile/duzolokedi.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1athfov46319ulg562ci4c9um2/jumogopun.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/023d6a7ca40738cefbfb559fb0fd0291/19089925915.pdf
    • http://alibabashipping.com/userfiles/file/43204403056.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/cfuhat82poi224ldbq2uf2lt8d/lojamo.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/394ec1a73046d659c70acd7ebc9df1be/jumevumebiretogavek.pdf
    • https://guruamardaspublicschool.com/userfiles/files/tugonixuno.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/8ds03ead2sus46avjcj95v0v10/noniju.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608239bcc35ca---vujezeti.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/30760741723.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c1809a975c6504c8d8b79cd34133a319/zojavokomil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=linear+system+theory+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d415.bin
eae242ceb1c99352d131f456c459eebf7f39fcfa968dc1e79e08a8bf54cff82a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 17088 bytes
font_01_sfnt_off0001013d.bin
d6c0cf27dcbb9e8280bb34250759213252b8cd8f31ce1ce1f8a66c47f8544ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 10788 bytes
font_02_sfnt_off000119eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 16792 bytes