Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b9428472f2e69c…

MALICIOUS

PDF

84.0 KB Created: 2021-08-04 06:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdfb5a47682bd6759855279049572769 SHA-1: 4afc3e42378d628ae337e8c227f25f36d0aeaf87 SHA-256: 66b9428472f2e69ccec5276a84e866e43e5277732f01adcc81efbfef648524ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution, disguised as a free download. No scripts were extracted, but the overall structure and URL findings point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=rich+dad+poor+dad+pdf+free+download+in+urdu PDF link annotation
    • http://benthanhsgfarm.net/images/uploads/files/97729011737.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oa0u6hbo8q84v159ph10jbm9m7/sosipu.pdfIn PDF document text
    • http://klpa.net/userData/board/file/rogupanenijikotanugabejal.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/56988200934.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/8023734247.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/kiluromiteweluremoz.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/boxiniwuduvajizajaxijo.pdfIn PDF document text
    • http://goref.ru/files/file/9470346732.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/63009374556.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/29742769513.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac00c02ced---fifepitebubifit.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ab283034---jaxomerudaf.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d5a76da2b8c8576e6f74b0bf95cc3db4/94198268102.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/bikaviboganerefepetuja.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/q4c1t73dlf8l9f2fpp3tinrbso/2660023114.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4e1d7d87---sosuxurajerafeluzi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608389667a802---gatoxogo.pdfIn PDF document text
    • http://irths.com/upload_files/files/xuwafisiduluxasu.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/40203538263.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c2a2e90503a210a1aa4d4590111e01ec/wonenutaberejudabefozo.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/dunowajonemagijedapilev.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/8356183574.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/35219fee0c8566b71591f3b659dbb21d/zixuxumiwonodul.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010963.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10963 19300 bytes
SHA-256: 8b2c0895676eb914751a2ad7c33aa1081924dde46aebb36fb97a3f12a267761b
font_00_sfnt_off0000c59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 16824 bytes
SHA-256: 05e49aff78125b0004607a8daa28067091097e9d78531294ae902a13b3a33f0c
font_03_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 10680 bytes
SHA-256: 43d3f58817c2dfa50b5b9ea588f800340ed107f798d6c9ab2f7ca8827bd3ca28