Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ec2200e47f2ff…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 18:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98d35716e77315b62eda78516942c9b1 SHA-1: 99a48332917c42d2292a306332eba65fe07b841a SHA-256: a76ec2200e47f2ff7e002eb1503fa2bdcaa15b0a5ebafe1d34dd8a4e9002b1fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering attack to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9a42c496286fd87bd038208a04f2bd1b/62576478396.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077695850dc8---bubezobafadebexawuluto.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126653437e---kipuniferemapelozera.pdf
    • https://combrooncom.com/contents//files/wezonabogukonolexaberuzuj.pdf
    • http://51www.org/uploadfile/file/12ff77a280f72f98a512694e0101d3e3.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1hor5mci9o6c02stq76tfvmcv4/72256246251.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d70c17d98---pobixirinuz.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c878720c1c---47843634792.pdf
    • http://smit-electronic.hr/upload/datoteke/babamoruwiranexakedezuteb.pdf
    • http://climacom.eu/userfiles/files/30757661007.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4962129f98e7db4011ad4aa4eff0b1c4/20353897233.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/oilbftlp0eq9o4rvvspgiopv4i/2261891705.pdf
    • http://0-50.ru/userfiles/file/gofetusa.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9acd4d8132f79008c8f472d5a8a5d1d0/60877696313.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/watanawuwebufaj.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/46510345917.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f721b9ccdc---golikurelogoromuvagos.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f85f917c9---76130668436.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d3c954bd363b837c6d4dd0e3dd246006/48461434778.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b6b2906b---16340015146.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b992c3c928---11525664267.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c5712a1e1---nelopavijinibukulurotijex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hoyle+puzzle+and+board+games+2009+free+download
    • 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_off0000eabe.bin
02770360ceb235976bab54263b5ed308e5f57d0ebfc11d7fa7a67eeeb560ab02
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 15940 bytes
font_01_sfnt_off000113d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 16792 bytes
font_02_sfnt_off00012bef.bin
e54064b3ceca0e26d213bd4a51bf1ed64f2206fcd51dad76887e4b1e8c207401
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 11552 bytes