Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb1f1006a84a2d4…

MALICIOUS

PDF

96.6 KB Created: 2021-07-22 02:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 366483e83661e2edb2f3e743163c6d4b SHA-1: 36db3e0e7e700f8d26fdc165c53fbf9d801b83a0 SHA-256: bcb1f1006a84a2d4fb2771fd8129ae445d4b53a47294df94e307f28013787692
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or visit phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75485f350---27633679544.pdf
    • http://huntland.hu/upload/file/jugisomo.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1091579f40---filikeneledoxasep.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16258396189368.pdf
    • http://kpdb.org/userfiles/files/xelurijodojedeju.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1618e4248e---lonifotijabut.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f5a54179---fanon.pdf
    • http://slsnn.ru/content/file/tamitun.pdf
    • http://tele-klass.ru/i/upload/files/xarumowomuxomiwozufuke.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d51db1bde0e175b5437a0d611086a275/89853051953.pdf
    • http://sibservis.com/ckfinder/userfiles/files/89124185759.pdf
    • https://genegurumiraclehealer.com/userfiles/file/junotisisonevumem.pdf
    • http://handbook.hu/upload/page/file/vomewote.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/62604194598.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/doduvurubolefuvop.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c946543fa15634b8328364877fe7ef62/suluxexebabiselojaripe.pdf
    • http://manpukuorder.com/uploads/files/vuvofajilalabixugagelev.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c154a0470cffe952a35fa1176268996a/38139712623.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079534679386---xatususivupiw.pdf
    • https://majorsagilekvaros.hu/uploads/file/didefepixesitosereni.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/54367790687.pdf
    • http://www.puhito.hu/uploads/94214197762.pdf
    • https://fnb-concepts.com/images/uploads/files/56591130579.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dot+product+of
    • 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_off0001186f.bin
1ccdb14d49b44390642c3aaae620c1a6dde4ecaa434d062f64b331379a8d3bdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 17316 bytes
font_01_sfnt_off00014560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14560 16792 bytes
font_02_sfnt_off00015d77.bin
620cf64b1f0a8ad52e0a159cf83f254151b3908cb653fe561d0a28fbcf0fdebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D77 10008 bytes