Malicious PDF — malware analysis report

Static analysis result for SHA-256 414646435e3dec11…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 09:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43373e6a0dac82a0cc83c3d734a57ddd SHA-1: 5cce31cc17d1736da56b5393c94502cc37cb782a SHA-256: 414646435e3dec117eb38866c114289ba48ec32127cb91ee2cbdec728a478406
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 CMS uploads and disposable hosting, suggesting a link farm for distributing malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The primary goal appears to be directing users to download cracked software via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://kazuma.ru/ckfinder/userfiles/files/20144828656.pdf
    • http://spellenindex.nl/images/uploads/58230971343.pdf
    • http://1utilaje.ro/mm/file/gasevokaminifi.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h8qp4foh2q2picenulnadd8c2t/vibidigupisupobosewogalav.pdf
    • http://softwaretesting.kr/club/data/userfiles/file/20210909092140.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce9eb73ea5---8847363704.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8v676jttnaug0pp10s9ukaml76/viwon.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7a7b2bad15e9e9a5140710e18575c7a1/27121985617.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/dotomijeneja.pdf
    • http://luckysim.com/userfiles/file/48855274778.pdf
    • http://p-itos.net/admin/userfile/image/file/sidibimegi.pdf
    • http://musicpark-live.com/userfiles/file/59706136400.pdf
    • https://hazeloyun.com/calisma2/files/uploads/54407035096.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/torik.pdf
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/xurutejifozimegixotef.pdf
    • https://tutorbolivia.com/userfiles/file/fataritoxanusekafurer.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146af2c4af92---33484872952.pdf
    • http://bischofs-scheune.de/userfiles/file/vezogajomukigesozotedila.pdf
    • http://wittlich-luexem.de/userfiles/file/wivuroseserakopor.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/duvakesapegurusug.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/65065936280.pdf
    • http://chatyzvule.cz/uploads/pewilezojafufulute.pdf
    • https://evabizz.com/userfiles/file/1020252304.pdf
    • https://oferta.lt/i/File/rezeweralitarizuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=powerdirector+cracked+apk+without+watermark
    • 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_off0000b257.bin
9741676c8bc4f64512820be6ba2f3132d2c51335d78a553345155746b5399349
pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16968 bytes
font_01_sfnt_off0000dd99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 16792 bytes
font_02_sfnt_off0000f5b0.bin
86d558d50ea81e0e78f23ec299fa44d6ec1569f81d1028fc2a1688c09425de8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10740 bytes