Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa1d281a0f3f087…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 01:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd16a8bb95809a46fedd4399be4477f0 SHA-1: 605b098746a9f3cc6e269504372e18e011003ec4 SHA-256: 2aa1d281a0f3f0876f9b835acc4dcd1528fbd647cd6917cd84692a9cb2f73e8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://morganmethod.tuesdaytrader.com/ci/userfiles/files/91259817300.pdf In PDF document text
    • http://1-sanya.com/blog_images/blog_/file/dobexu.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/87057798199.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/nomuwud.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bevakegabubotugif.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/dularokujagefuxemafaro.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/456f4d1cecab295e1aff375817b92ae4/nelosenot.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/wibemaregotij.pdfIn PDF document text
    • http://autodilygood.cz/files/file/50346053231.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dfc45f625---mubujamofitekesinos.pdfIn PDF document text
    • http://homeopathyhk.com/files/73542896580.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/93663968646.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/36241760950.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/xuretatelavavudetevag.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613600372fdf6---57208893102.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/81985769509.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/denubujelef.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/13794139530.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161432435e6b27---nesafagatigiganevufazotex.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/xuwesilupenorugabej.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/19211816592.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/52724910402.pdfIn PDF document text
    • http://scarpatti.com/files/mutojanunuf.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109012118266515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=offline+music+download+app+for+iphonePDF 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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 17256 bytes
SHA-256: 58eba6d689c3236b6f29f38f9767d9783a316c6ee7ccc5de4eb097ea8c7ed155
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10996 bytes
SHA-256: eb9811613961aab9089854fa1376db80782e2239167db2d7cdfba34adcd2db0b

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