Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e77c9dbdb97e0fc…

MALICIOUS

PDF

82.4 KB Created: 2021-08-17 18:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 021334f84f08bd62f368a9630efc475a SHA-1: fbdead1681641e2aee5b4bcc3370b911881742af SHA-256: 3e77c9dbdb97e0fc510d70fbf4dda4c797d4d47fecddde8bc170a41e30d215ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of link farms suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50a033605---25257713787.pdf
    • http://cartonwrappingmachine.com/userfiles/file/20730515206.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/5830524008.pdf
    • http://colorfulmedia.de/fotki/fotki/file/49172931646.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/nukerowezubefube.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/227dks0uvkg593is7oa8r8jqi4/wegulomebevuget.pdf
    • https://micro-logic.ro/images/uploaded/file/begesaxonagogaxumo.pdf
    • https://pianoinprimopianofestival.com/uploads/file/mapomobisiwibesuwuvaz.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8565c34996---86969972896.pdf
    • https://betenagro.com/sites/default/files/file/buwilorumafuzobu.pdf
    • http://cokhitienvuong.com/uploads/files/13228377117.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a6methalqq9m0j14om9d408p8i/5708316106.pdf
    • https://pianotuningdarwin.com/userfiles/files/46074876612.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/wozavabul.pdf
    • http://cichanski.com/Upload/file/zexavada.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/63855489537.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lf1ut6kg4k5muicrcncpjtvspe/korawatobos.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160dde59e75d09---nusotamalize.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cd388e8acc0---fonirejokiwesosidevin.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/80821392444.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/k39ut31c178gcl788rup8p2p5f/nipomodak.pdf
    • https://finatwork.com/userfiles/file/4044027768.pdf
    • http://www.fotolia.com'>Fotolia.com
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+cdr+file+to+pdf+format+online
    • http://www.fotolia.com
    • 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_off0000dfb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
font_01_sfnt_off0000f7c9.bin
6b68b56a0627e4f4a154e86885a4ca702e61a36c06cd7d6082e355596d080106
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10756 bytes
font_02_sfnt_off0001107c.bin
f2e63f6758cea74c641ebfd39fd3a5426ec1b6adb8121f9474fc481e362add5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 16280 bytes