Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8845f7b185b4284…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 12:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04301ffad563f5c81d7fac1d0deec078 SHA-1: 469645e67f805c99f62487d5e8146b39ebb523ff SHA-256: a8845f7b185b4284d3f3e4476082c2e7d9deceb6fbac83c1c65b5e2201c53014
124 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV with a signature indicating it is a phishing trojan. Static analysis revealed numerous embedded URLs, many pointing to domains associated with link farms or potentially compromised content management systems. The PDF structure and heuristic firings suggest it's designed to lure users into clicking these links, which likely lead to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3798

Heuristics 5

  • 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
  • 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://atenngo.com/admin/sites/site/documents/tinibamebanefukusive.pdf In PDF document text
    • http://519pf.com/userfiles/files/rivalufodurodol.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/bofidifamixura.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/povesanapow.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tumevebukuponizetenol.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/wudatatuxuzisarejudu.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/204290651.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/devopakukabu.pdfIn PDF document text
    • https://bauarch.bg/files/70109283211.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/92546683911.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082840c45b53---38186557862.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ce856a38b56---55990830077.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/33547134322.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/dubudadezoromegamabodub.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/71633987685.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/19234471938.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb08b1b082---xalekuxelimotu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b25f44dbd---70003331688.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ed0e4cnbaud9pibr0ahc9hvq6t/sigitilupivudebupu.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/58035863818.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///wigufelupem.pdfIn PDF document text
    • https://telenovella-bg.com/files/laxifomekubevajezi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610015b17f75d.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2683f8f59a---dazilo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kaxubugovimasotimewak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sheet+metal+working+operations+pdfPDF link annotation
    • 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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 16576 bytes
SHA-256: 659fdde192eb3e2df2ca5fc48ec3b2120417083bbdc4e1a18799d657516c88ec
font_01_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 17652 bytes
SHA-256: 6f604ef7276cde74eef938a722741bf424ed132035428c0c2d25b3567a564d58
font_02_sfnt_off000136cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1