Malicious PDF — malware analysis report

Static analysis result for SHA-256 617654b2db8cb7ba…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 02:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6167bcae799af1cc2370445dc4192ef3 SHA-1: ce000d9daf96dda8caf7874e7bdc47a9d088d476 SHA-256: 617654b2db8cb7ba2499b47a580f9db4416cd22ad3a95d43d52ca915f3bf34a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://nomylo.ru/uplcv?utm_term=birthday+party+political+party
    • http://digjamaica.com/app/webroot/files/paresumututotusix.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/29fdfa8737339a25a3d8eb3b49c972a3/62637503355.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ijp79ri1ot9cifrrqghd1v6176/68648210778.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60149e39d1---54946777174.pdf
    • http://alliusie.com/userfiles/file/58573050348.pdf
    • http://technoculture.cz/admin/upload/file/47208017284.pdf
    • http://prodottoitalia.eu/userfiles/files/kemasenenozuxike.pdf
    • http://eltonltd.ru/sites/default/files/uploads/disuf.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/7224987362.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a164779787---38080174605.pdf
    • http://www.peretprod.ro/content-images/file/49117258803.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5a45b5d5---46086819164.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c58c3ef719ad11896df8b036b4d03a5a/50492298447.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f53186f34306c4a1409526365d4704bd/zupuwawolajo.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ebfec44a---fitomurivugujoro.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/932c614971fade83510274c4479b29ef/zimenugavomu.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/gubogokiwokob.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8452e67f9---denuripelulokejavutuwu.pdf
    • https://atlastoursntravels.com/userfiles/file/dezis.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/d1ktkkuuiu31du4pts3ub1anvs/xexumedifabulilebifuju.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f72c41119a5f81fff44c4f330f84dbd0/29783368726.pdf
    • http://rudolphalexander.com/uploads/files/derefexi.pdf
    • 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_off0000e9d5.bin
75307d8e6d1ebbaa4f4a7718fc3c48063943af9a9b52969b94fa1330a52a9172
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 17312 bytes
font_01_sfnt_off0001174b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 16792 bytes
font_02_sfnt_off00012f62.bin
a7d843868afc44915927e25e1aefdadfb729ddf406b63a231b2f3d50ffa49e6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F62 10376 bytes