Malicious PDF — malware analysis report

Static analysis result for SHA-256 e464f2d5c64b746b…

MALICIOUS

PDF

89.5 KB Created: 2021-08-26 08:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bc9f1211fe53be8e2ca5643316d3b44 SHA-1: 399a8e0c33cf5771d03010fba9891c0cc140f9f0 SHA-256: e464f2d5c64b746b7a287815eef4ca3d09e4cefde432a2f7b132194d92853306
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malware or conduct phishing through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://infrive.ru/uplcv?utm_term=the+history+of+egyptian+civilization PDF link annotation
    • http://aksaaydinlatma.com/img/editor/image/file/73047050738.pdfIn PDF document text
    • http://toonesk.com/upload/53517877225.pdfIn PDF document text
    • http://zaiger.ru/img/file/17159766463.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/262883570.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/zasokaviwe.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/lejb42tg5ks1fla2up07i2i6n0/wepetubitizirebudato.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/31747327095.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/feforakik.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/juwipesogomifigozubaz.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/meragemunajuri.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/fuzegux.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/80406406082.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/jepejagetasevesokokasibo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/71768275171.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/89865632638.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/40033321612.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/miziviwipujafexomiz.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e5943bc79ed---69678910500.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/eufoqpi9c52h89m4ru0rrk5nlq/jazesaxatitebin.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8e84fabae717ea75de09d4971b3a5e4a/89880899892.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950e848f6ed---vokadekotadem.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/27577074399.pdfIn PDF document text
    • http://ibb-online.ru/f/file/butarejile.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_off0000fadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 10964 bytes
SHA-256: 938c01a8ee04a9bd0fd39b382d5330b9c5992b85be774f45a9daafd7ff53ef30
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 16736 bytes
SHA-256: c7dbc99cd439f578c21e23d0214619226f14c865cba404009e22fab1865fa7e2
font_02_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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