Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ee73b21f08ee1f…

MALICIOUS

PDF

73.0 KB Created: 2021-06-27 08:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 785f920f13242a41b18f67d87b26c002 SHA-1: e0fd6a31b51059100d397a47c3967b807e2058cb SHA-256: 86ee73b21f08ee1f40b6d68be6b806c25fe8b682cf08496e916f6c9526e069a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristics indicate the PDF acts as a link farm, with many distinct hosts and links, some pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd513cd499f---17398494837.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc543ac58c---16416412200.pdf
    • http://studiosantese.eu/userfiles/files/91819484546.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/38405035418.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e49547c546334011e4425e9ec9c988e1/14846756639.pdf
    • https://aawyx.com/sites/default/imageuser/file/29158030065.pdf
    • http://infrabud.eu/fckpliki/file/totimumupowunanoxit.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4ea25d297dcd1b1549b824ca0df2f8c3/zanezinoj.pdf
    • http://kiuanai.com/userfiles/file/72859913867.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a216f9a96b0---58154515514.pdf
    • https://jahanchart.ir/data/files/file/bibanexozanunibixuzi.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b639a836850---94714107997.pdf
    • https://deltagroup.bg/uploads/file/xumotazasarepalorasokab.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e3312c2fd1361570c994f61bc9057db2/rinoloso.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/u5md4pj8ucfftlabs6av8o6adm/farikeworujoloro.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1b2af1f7c24cd5612b47b5260ff54968/54665420337.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be8af730553---75012832396.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4e130b89---lajelaj.pdf
    • https://novamakine.com/upload/ckfinder/files/28250583415.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7659e5f9c---fosejuj.pdf
    • http://merlegdoktor.hu/tmp/18824695808.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90bd4c06c4---dejobiwovoda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aviation+jobs+for+freshers
    • 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_off0000bd65.bin
0e7a7af3fbd4cfbab5f5dea050b52356022effb4211fc9c1cf90c7a3adc2fb08
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD65 16040 bytes
font_01_sfnt_off0000e6ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 16792 bytes
font_02_sfnt_off0000ff04.bin
60786555c03f93c2752949953bf7f4b32b1a745570abec56e9f0b99970bbcecc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 10584 bytes