Malicious PDF — malware analysis report

Static analysis result for SHA-256 762be61f36bf95a6…

MALICIOUS

PDF

79.0 KB Created: 2021-10-08 07:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 80ed68489cddf5c74e17e8a806df37b9 SHA-1: af706b9f51f2c2a2c4916ca48086e4bb920639c7 SHA-256: 762be61f36bf95a624f25411caea8cfe1cc55477957e03917a08528a52af3bb1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting, likely intended to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://floridainvestment.cz/files/file/lulaletoteni.pdf In PDF document text
    • https://rpaxis.net/userfiles/file/luvureg.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f6ea7248074a7932c04ef3331656030f/67138544836.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/25919314486.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/fijoxizudimadejuxetajol.pdfIn PDF document text
    • https://indian-sped.szabgab.hu/fck_uploads/pdf/75581363328.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a9a0b22e2aaf8574fc05f0abf3fdf9ce/disosazowofidisexisav.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614271d77f643---tijogaj.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/59378497125.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/77498497908.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/jufoxoziliv.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/xibobuvuzu.pdfIn PDF document text
    • http://metallpress.ru/files/tegiwumuzudabifebanomiwib.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d39122623---vukulotesejeboxutowi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/35109816996.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/sabunotajuxodix.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/rimofogarulexemir.pdfIn PDF document text
    • https://soechi.net/userfiles/file/85360458079.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/67626218585.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/14389739612.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/15820377070.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615339ca0973d---mogutulelegure.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/remopawuluxexivodelumawuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rickets+in+humansPDF 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_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 18484 bytes
SHA-256: 2dce6e1931697ce3fbfba2dc43fd6e62ba7304849a2c5dcb1c0227c99057fb0c
font_02_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 10468 bytes
SHA-256: 9a01d6f76d6062c004d63e584903476754709cb15961dcc78ffd8b1492e87bd7

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