Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8626052170286ae…

MALICIOUS

PDF

71.6 KB Created: 2021-09-19 11:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82567c4fe5ae5bbf0afcd1c26705b344 SHA-1: 8dfbac03d94d3b4524d6cc29b29d6055fbd83ea3 SHA-256: e8626052170286ae564a70271b05822cd56e2b49e43b3c8e8c0b4fef023717e5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, indicating an attempt to redirect users to malicious content. The heuristic firings, particularly the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=download+pokemon+gba+mega+evolution PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0749a7379aaa552b4f945c01c22aa712/20598287569.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/30704642400.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/31092343561.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/87376715666.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d8b29b285d491aeecb19cf0907f6c177/72304309896.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/setas.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/55364050164.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139898228fc3---95693098973.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/sovesozig.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/76918602774.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115a89582c---kepir.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/xalokesi.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/72796631609.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/77006361958.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/gajusopolife.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/68266992977.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/kofituporatelefu.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sefubiwokiru.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/16402364517.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614028b2dcaa3---98341247330.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0432d958490f8e31af32ed4bcbb0efac/bipikejexoxugofepafipelat.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/fupizifedafi.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/86115654328.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 10952 bytes
SHA-256: 1a9f32e77ea33d5225c740d9ac856829870cfd73ba56edb43c70a69268729eec
font_02_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 17640 bytes
SHA-256: 61b53e4812aa240acbba5e13c8dcc1046ff18004544bcceed5804d791e68304d

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