Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82a66d9783858f5…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 13:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e04c70de431e1816ab071c3c9090b2f SHA-1: 7ddd7b6a0d9134ad27ff1b742beba44586db34c8 SHA-256: a82a66d9783858f588b599b316d1e9c58b70ceb225c29f4c7955bb89a4851176
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to potentially compromised websites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of multiple PDF-specific heuristics related to URI farms and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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=frl+unit+function+pdf PDF link annotation
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/35884205551.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/7612186415.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/79374275389.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/zokikepejaravoj.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/kifedaw.pdfIn PDF document text
    • http://banquat.com/userfiles/files/87119362718.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/renanagezuzefoner.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/51564174736.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610046acd1e67---voxifisixiwuw.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/5559991552.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1da68339---41148978787.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/8927973808.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/dabatul.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baf718b590b---94407965745.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a6a95857a0db161bf9550a4d2188a87d/36429517941.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160749fc1c9e03---gelekaxakemugezojekibives.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6c0f6d225652a84dfa2f572ebfcb8967/42597728578.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lubasamaja.pdfIn PDF document text
    • http://hasyo.net/files/file/98568588187.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fgoisvclu7qd74innuro85lip1/debosetug.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160729487d41d9---nakivolidulomobefa.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/76a51c13cc92a6170cd8225e59b36b85/35803488054.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0d6f3322fa132888fe62cf62150db33e/xigalopuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 10228 bytes
SHA-256: 47b066bd0ab915b58e0934b677912f7948d170ffbd96451992b761671faeaa62
font_02_sfnt_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 17632 bytes
SHA-256: 828aab27f3784764c0e1e732184d42458ccc0af511a89701085f577a0943a3b8
font_03_sfnt_off000144da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 2068 bytes
SHA-256: c1a6cbc687586f74c636821a73f6352f65dbbead7a650a693409bc3a91a35709

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