Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a071518a19bb0bc…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 01:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0af44391efaa7918b830976a8d107791 SHA-1: 0b18bc66599717f935987a0228b78bc38df65684 SHA-256: 8a071518a19bb0bc07f249f91222b60c6390f35157dd6cc900e23f32ba3d3d70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a link farm pointing to multiple compromised websites, likely designed to trick users into downloading further malware or submitting sensitive information. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit user interaction via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c9781fbf1d543eae2166ebee783fda9/nozudipumi.pdf
    • http://hanart21.com/files/userfiles/file/11498032193.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/jibibuvojesulibipexep.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8c5cf80f442a41784b18b11b98b22ed8/lolilujogujidezuxipekibad.pdf
    • https://soechi.net/userfiles/file/80955368208.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c48d859a64a---xejorapozi.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e5ehluurrkvi7lpdqtpi7jj7fc/bamewarogufifarejup.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835d105d32---waperapamaf.pdf
    • http://c-amc.com/upload/files/mikojeda.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ktfsafstg80imt12a6g77vp1dh/dalotuzubulaxup.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dcd40be53ff3e72ac8ce9f61e30b8a44/99736115840.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ecef62b20c6e1d54a04510b0acb8dc02/fokulawovawenidup.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607217013aff2---darinenibebogubotagebiraf.pdf
    • http://xinyuemu.net/assets/202106/files/20210611100650799556.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/71430b365e7bdd4554c64b8a9b2618e8/90187738447.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/dfaa06d796b9c66938f143970caeb27b/xemubuwugerugawalaxirix.pdf
    • https://deltaguvenlik.net/userfiles/file/romavekaninawazijo.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1768a0e---75382726493.pdf
    • http://3bbb.fr/ckeditor/upload/files/59619621210.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0fcbd0ac71d55b20a4690ce6970a6ec9/jubixubexejomijinut.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852fa48102b---36851108091.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6rl9b3plbohuemtq820dnsr6dg/72148904206.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b47c23bebe0f04f7b4d3e28547c4b3bb/gufidukabuvef.pdf
    • https://pharmnet.cz/ckfiles/files/files/56123343085.pdf
    • http://chrislahoda.ca/userfiles/file/wovak.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/22632827845.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f47d97b0819dfd029468e3d7c660da78/gotobunimavojip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=shell+script+and+condition+in+if+statement
    • 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_off0000e65f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 16792 bytes
font_01_sfnt_off0000fe76.bin
1b467e42f79bd9204f6a36d3a84534adbdfbce86ca573ca9b82fdd880028ff26
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10960 bytes
font_02_sfnt_off000117a5.bin
22d9bf9c03d43f78ac049a39afbc5bb6f08a00c733d42369d22a7c1939c39d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 17744 bytes