Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d21f19622649be…

MALICIOUS

PDF

84.4 KB Created: 2021-08-20 21:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4268e6431bc2becf0f73d06d40e90b47 SHA-1: 90f6c54910d1bbe40f2b3f6e6699421072d01582 SHA-256: 49d21f19622649be4109ba0fba4d4add059ab69a4e76b9fb8bdbe4fe3d902c68
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://heatherjansch.com/ckfinder/userfiles/files/mubujobarowuse.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c4f2ca6527dc7f6f3b347414ad11c864/45014825897.pdf
    • http://euro-ex.com/images/blog//file/93208040264.pdf
    • http://joyearland.com/ckfinder/userfiles/files/48683385972.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/46222820969.pdf
    • http://botosani.ro/img/uploads/file/wezebobojusoxofadujeretus.pdf
    • http://vds-construct.pl/userfiles/file/46833036032.pdf
    • http://meteosputnik.ru/userfiles/file/wemidosi.pdf
    • http://chinazzjx.com/d/files/34451816830.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/94724788251.pdf
    • https://togeltop.net/contents//files/tiposukaralijazer.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a90fa1ecd---1526479703.pdf
    • http://northcity.rs/slike/files/jevadedezomimuzelilaxu.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607feef7a7037---lokumuzero.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a512db81c86ab4445554c2b4f5df6604/tubisokavinirifawilu.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vr15s6s2ui45jqi30kln9e2kd7/pudizegewivile.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/muzerexol.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e90129115---5203075370.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdf
    • http://jjinline.org/file_upload/file/takegafepu.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3e98f881---fatixigizideponijijoxap.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608401979ba7c---situv.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6a5a2aa5---88222587155.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab932038df0---79758198772.pdf
    • http://herbwaterthailand.com/userfiles/files/12299938330.pdf
    • http://lawngo.net/fckfiles/79848398414.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c0c05a5e---11031135378.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=24+hour+clock+worksheets+ks2
    • 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_off0000e5d9.bin
2255a83a69624f05df27f356ab57cfc6715d2b0ccebbb679df20b47eef5f2b78
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 10348 bytes
font_01_sfnt_off0000fd93.bin
e44b71c3d86928e9b9ed7ddcdd0cedfa23a59a28c17ddb1422209b350f93e403
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 17568 bytes
font_02_sfnt_off00012ac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 16792 bytes