Malicious PDF — malware analysis report

Static analysis result for SHA-256 458d0c16370fde22…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 09:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d6008dcf0033d462dc9aaf3861298f6 SHA-1: ce66ead35a018dab931184ce4dd29617085cef53 SHA-256: 458d0c16370fde22cfb8fa945fcacbbb1a4cf96138c84ddef4cfec105bea2832
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection, which is a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5a31ae18480472008ab80a8c3c66d99e/10391694181.pdf
    • http://moto-bike.pl/userfiles/file/66815021313.pdf
    • http://uctodane.cz/UserFiles/File/kupuj.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098fdb4dcf5d---nizitog.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7646101905a74fe41bac3cc14afef0c5/16140959931.pdf
    • http://sushinamu.com/uploads/files/2094201367.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/cbb9a66c29044f05a7210b5e6634c8c0/tixadenonupo.pdf
    • https://pepsima.biz/files/file/84342558734.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/gutoror.pdf
    • http://hysansam.com/fckeditor/userfiles/image/xudogojumonojulenapi.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcfa134e68---84682163841.pdf
    • http://alumcity.ru/userfiles/file/63079965048.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc20c43eea---4713897543.pdf
    • http://nedirajtebosnu.net/userfiles/file/gikux.pdf
    • http://dlt-nkp.com/fileupload//file/73239984784.pdf
    • https://fruitssupplier.com/app/webroot/img/files/loxutoredekototekozawe.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/40204023196.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9b8c61694087b361f506d36b240c1639/53264152009.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b815c312f0---bavuruxujiv.pdf
    • http://cy2hand.com/userfiles/54293506432.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4a4160097b305e88d59521b9269dae5f/gogekaxatisevuno.pdf
    • https://mami-m.com/Uploads/userfiles/files/kafapafowa.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c2695977617---juvizoboxi.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/68562224464.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/37c15bae36bc076189b7a81873678b8c/lojimotowu.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/birodoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bismuth+sulfite+agar+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_off0000ca67.bin
10f6a62d19fc07109a4c63cb1639bb0ac6bd40d93d3aefc60de756b8d7070493
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 18308 bytes
font_01_sfnt_off0000f8bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 16792 bytes
font_02_sfnt_off000110d4.bin
e69115dd8e4692085be00f50b0e478893cf508001343f4989ec50b4d41b0f7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 10872 bytes