Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c3b83ba0cf9196…

MALICIOUS

PDF

86.3 KB Created: 2021-07-06 19:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d4eaaad10980469d910c1cdc59e7289 SHA-1: 766ab77040889f897baca6129953cc31924b6e92 SHA-256: f5c3b83ba0cf919683dc058bffbcbf113b8e74cdf082ff2daff21c8a3b19084e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://loctra.net/userfiles/file/turitepawamabe.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff3a6c34cd---dedone.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1747afa9---jesutovusa.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074169b2c44d---9940766843.pdf
    • http://immopolignano.lu/images/91527349034.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb5b4a0d6baad629048c0d1f8c3463e1/retelopetumadivofovusebi.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/91855735389.pdf
    • http://chalappuram.com/userfiles/file/tupapidujexepuvo.pdf
    • https://feng-shuiworld.com/userfiles/file/8510600698.pdf
    • http://sl-light.ru/design/img/upload/file/tavabulobupakagis.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/54bed3f3167ddd551d4b8925ee838dca/zamokixodadidexober.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/robogaxojujosudeja.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/52aec23d307b5cd3084c873153e90839/98299653771.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/32664918929.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb44b1b04c---44464141123.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eili2rrtt9aboau215rhp4cdo1/24097220845.pdf
    • http://1utilaje.ro/mm/file/pepejupes.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7e74ff56---xebiz.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/loduzofugaruwagef.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9803501ce3---lurizidebenunanube.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i5t4bp6kvcon2hbrpodbl111m7/botukilaxamosewosa.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc498dcbf---83240738836.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfbaa481b---rarekepuluwowek.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/81deovu161u2bl4adtu0kbv7om/10247488947.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=different+functions+of+entrepreneur
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f027.bin
e1c2e551350c5500d582f0e07f5ad7dff01051b9b79374194eaa990f9544c78d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 16928 bytes
font_01_sfnt_off00011c3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
font_02_sfnt_off00013454.bin
92d92185d721276a53a167bb92658045fc525fd39b8c311a570c14afedce9dee
pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 10368 bytes