Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da61145d52764a1…

MALICIOUS

PDF

88.5 KB Created: 2021-08-14 21:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e08c447e330057cde5b1ed804c5b5a4 SHA-1: a440adff1f05290e2542a341644ba3a19ec82649 SHA-256: 5da61145d52764a10e977bb0d1ae40e2120b27a571f6cb305fd3f5dabced8ef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7750348a---66240166127.pdf In PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/wupagubibuzilajolazowenet.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/vemof.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/18744328830.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/22541364292.pdfIn PDF document text
    • https://stauber.lt/images/files/32769189136.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0b856eeb3fde79413e8b74a4224951ac/xivurelukutogilatafise.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/20141752747.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/82217137239.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac63c29a7---mukeminikibora.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10338353529.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c08d1b1188e302d9677f30287321479a/49309960839.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/i41ajo23tmg4e780jdulc7gv7e/27627747534.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/romoli.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ghco73i9h1ga7a4e43bgsp6567/xemeninotumilezojunewu.pdfIn PDF document text
    • https://mmszke.hu/files/file/89776749254.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/masazugapakibizafas.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c3dd7157---7651971286.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/87289436981.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68534f9f6---56519225731.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0c5bb4e7807abb5647f673f676ec47e/93663345580.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c9eb53b4---60872995759.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720a18ef73---88435172996.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///72977984696.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/lepipipekub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sample+of+profit+and+loss+statement+for+nonprofitPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 17524 bytes
SHA-256: 7626faa96b9ff74a6cc562dda733c8311a3ec93ee26a426c294b352bae856766
font_01_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 10736 bytes
SHA-256: 9cd3510f31c822e13b33282fc405c47699bc1cbb978ea7f406f8051f2239f119
font_02_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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