Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3911dbb1734afbd…

MALICIOUS

PDF

89.8 KB Created: 2021-08-07 09:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: db48692ad181b22aaf9bfd2c4800f12f SHA-1: 02a973766b3530b4e90c43afbd3492995fc403cf SHA-256: d3911dbb1734afbd377fb6bcc56bd079fad114034467cc137bac62086ae34877
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites for phishing or malware downloads. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8291a2eb93f8911a0ccab916b9bbd5a0/vuzenukominazezeni.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec5777edf---zugaxufisakopimirufas.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lodugewefeneraxivoni.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9ec51257---galikelixakedutib.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/bujosuxisilinoz.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-26/20210626025222614842.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a475c7559d8---5505385398.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7963e6fcced242d478eecce57152e2ca/wikijebebawixemilaresux.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/jewifa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0277330cc3---sibafoliwuwajirefofovod.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/76887560702.pdfIn PDF document text
    • https://granitnet.hu/editor_up/43141253123.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/81455109698.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/jafonuwemuduge.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7842bad13---11560955207.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db0ae0a07---26241228939.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e23d34fd2bf69bcfee18609205df68bb/46367819916.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b754626664ed3ee6d95adafd5777b3d8/90227726712.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mccsrucqrqp8d6089ilnr7ntv1/dexemopedesujutugidizevu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/lamuturada.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/21204998662.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vasirizutanuregupufiv.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc64abbae6---gumorosomifu.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/6683867158.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081592d2ab54---xuneguxowulajoxidad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+factory+reset+iphone+5+without+passcode+or+computerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 16956 bytes
SHA-256: 6026bc730314f129648f22bffcf635a542f6080c9deb42c6a38ac3c624831e03
font_01_sfnt_off000125b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 11264 bytes
SHA-256: 6b651a4fd9fa7691dad90d26cb3f5e87d40f03cd6f68c6ce14c773bdc936e077
font_02_sfnt_off0001400b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1