Malicious PDF — malware analysis report

Static analysis result for SHA-256 64540b28b82f207d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-21 06:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 628b87c3614af45d23fa94df65d7d6ec SHA-1: b8d81bd036b5bde19ea7e5d857389987a35ce250 SHA-256: 64540b28b82f207de9ae9c9cf8e5a8744c08d153df4d772c76f0a0f900cb3259
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://3e-recycling.ru/app/webroot/filesfiles/lufop.pdf
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/zifuvis.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/24d8a47471470aef6cf88f67574e1a40/21978422853.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/fosiwuwurareliroxoxe.pdf
    • https://camelcarpet.org/d/files/13971624127.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/92664927231.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a1tsj6vjq0jrss780gbfirqc11/79627665155.pdf
    • https://erdenet.mn/userfiles/file/50308626628.pdf
    • http://www.puhito.hu/uploads/dusuzujerare.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b0c54eb9---68019887602.pdf
    • http://iphysiology.ru/upload/xiduxafimasazagofolukopu.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c12e2501b16---zanowaladazidodikoz.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60592b583---jepisudowajuru.pdf
    • http://mlight.cz/archiv/file/pixusijanixuvalasik.pdf
    • https://papiratisk.cz/soubory/bipilo.pdf
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57da8f4e6---xatarebixogi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/700p5n1dgtfcpblvpsl8qsr6r5/49576009948.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f67c8h3o6n6sg6c9nck5gc40g3/39792273606.pdf
    • http://www.celso.org/download/98194839544.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/47beff338f525513502afaadd700b760/zititezokin.pdf
    • http://aisef.org/uploads/userfiles/file/file/81149555414.pdf
    • http://ritadas.in/userfiles/file/14710442356.pdf
    • http://helder-effect.nl/userfiles/file/40628032958.pdf
    • http://sanarina.de/ckfinder/userfiles/files/67677784740.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=presentation+for+phd+interview+ppt
    • 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_off0000f66e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 16792 bytes
font_01_sfnt_off00010e85.bin
f3e784efbb86a3e3f59d071e249c40e9166082bc5ef7368dbb4a0e51f8044b1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 10700 bytes
font_02_sfnt_off00012717.bin
7b0c582d1637268093afc7545d4430fb0c42abcc07e2170b089d1f3d48e994a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 16788 bytes