Malicious PDF — malware analysis report

Static analysis result for SHA-256 283dda90b8f0dc3b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 03:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc3146d0c2c44de8a7500caaed718121 SHA-1: b99363fdab894cbf7069a8d06907c8ae2104b517 SHA-256: 283dda90b8f0dc3b608dd07360c4a03ec077992237a65948fa25bafd098c9493
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://ilovegabal.net/fckeditor/_upload/file/tuvezeketagit.pdf In PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/mufififobajanej.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160884ed891aa7---37349443235.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/76062246624.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/dixunukofobakegijofez.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/setarafogi.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/serajaxonamizozaxakef.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/xokijaripijevofuv.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1af9f5f766---77909158988.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/60718122772.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/xepalejo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g159jsflljdpntqjv11g1mr253/gowavotefodejomesepulel.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlajbh09qjdgkl1kp7mcoe6soj/zegijezom.pdfIn PDF document text
    • http://henca.com/files/details/file/93853920180.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/kakederokonogudibe.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/fagobuzumakuridetew.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4c7db01a---97169704017.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/setivasofakatedaxov.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/49764666988.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839bb2bd51a---firojafomolixenewag.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/bowevevipajokamimomikog.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608226f824359---veroxologam.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2390584d6b445f2006365c9286ef6cb0/33582091082.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dea15959c---55235435327.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5dc469fac---74380467792.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090615d28579---19386389053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=senior+financial+analyst+interview+questions+and+answersPDF 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_off0000bfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDC 16212 bytes
SHA-256: 66014fe728413c9a5aa8aacff2a73e1bb6611c7384bc6d1ee2acefce680d248b
font_01_sfnt_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 11056 bytes
SHA-256: e9e681706900bb9fec2682db393d36c29c46310cc80d7a897a0fb6d03ad81753