Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb90529d6b8c3efb…

MALICIOUS

PDF

83.2 KB Created: 2021-08-20 05:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90df5644debb051b4fd2e5fbd7fd9859 SHA-1: ea955af694baba066dc6253834dccb4e1ea635e7 SHA-256: bb90529d6b8c3efb494111720141952af6e90684f15ba259d7347cadec772073
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://uticachemical.com/files/upload/files/kajajem.pdf
    • http://evpltravel.com/xv_image/file/87843369805.pdf
    • http://yesilderecine.com/admin/editor_resim/file/17545017075.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cc8075e75---rusaxatedetukig.pdf
    • http://sampoernastrategic.com/uploads/image/files/gexevixovegilugetisu.pdf
    • http://zovsh.com/Uploadfiles/files/1369752063.pdf
    • http://pcwenhua.com/uploadimg/file/16229683962006303076.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabacee427---54330501519.pdf
    • http://portalcom-b2b.es/img/user///file/_0334987001627122849.pdf
    • http://batiment-tunisie.com/userfiles/file/42479935007.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/87033556509.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7bb3ad10---68006169680.pdf
    • http://www.dilipprabhavalkar.com/images/file/suduxemedudofakesupodele.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c4fbfb4cc7fdfb32aac5d6a086efc1ca/32791406435.pdf
    • http://finproekt-msk.ru/userfiles/file/wuweferawe.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d0b66e38e4a5969ff0c20d1925e7dd40/6726134150.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160908b05a68d4---busugezawu.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106150903522443.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8c7e8e61---69957719079.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e4a0724d---naxebalodowaxapomuzafosix.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1t8bsuh7l23m599tqsqkq06pt4/juvamilobuj.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/4220fbabea18c5ca068ee708d11abdbc/fasifedesamorip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=plants+vs+zombies+2+para+pc+full+espa%C3%B1ol+descargar
    • 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_off0000db41.bin
6d31019e1ace9c855b412409a708f8fde43477f09e7002ce3626eee95b08847e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 17824 bytes
font_01_sfnt_off000108c8.bin
7e6480a97af6c6b065a4850c48e60e3af573fb2cb0d991e9192f8fe552ade9a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 11656 bytes
font_02_sfnt_off000123fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 16792 bytes