Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b089d5eee507c8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-24 08:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7998a811939f0f593658c97c969e35eb SHA-1: 1b6c30ee9161426e5e711a347c9bec743d40f2d8 SHA-256: c5b089d5eee507c8604abc6917846922b52d89776c27eba0ef1299fd9075ec8c
164 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various URLs, some of which are hosted on potentially compromised WordPress sites or disposable domains, suggesting an attempt to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sarkar.ie/userfiles/file/dilakor.pdf In PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/jiboxodutafa.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/62215809039.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/81052291651.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///7651660983.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5424c19e---33583694150.pdfIn PDF document text
    • http://unsersohn.com/images/file/levorujaduk.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/79206486673.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/51725165502.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/84597630793.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/86113102475.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/61079338418.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/wodobixet.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146766d8f669---rukibujosovilonenajizup.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/mikodolidizijuzegirib.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/17546551247.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1cb2c6b75---tevazajunapavopomuji.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161458c2fef091---33765708539.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/63784731809.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/navavonixikeditimugaba.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/nezewilekemimuvijuzibutu.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/gital.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/15032797513.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/femuseva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=move+to+sdcardPDF 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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 18368 bytes
SHA-256: 11120291721c05f9bfd9c0e1e4250e866ae62e2ef1bcf9465fc8e3d9093b1f0d
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10180 bytes
SHA-256: f82a79a67ed955b9ae61b8ea8c155b30fb74a836bc2e51da4050802c1e2f7f50
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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