Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3825020b025c25…

MALICIOUS

PDF

92.1 KB Created: 2021-07-08 09:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d20cc3cd3128e5bc43794364fedcc220 SHA-1: e82c06f2324682d9ae4fd7c4ea8dce6f44b061df SHA-256: 2a3825020b025c25760b7b8ab0a3bbf58c27c0b2f3b7f3787dfbea6d990fc28c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm serves to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1787f90308---43950133661.pdf In PDF document text
    • http://hockeydh.com/files/ups/files/dabezeg.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07fb5bb13b---wotelu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-22-16-37-32-17.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/lalim.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/nowojixe.pdfIn PDF document text
    • https://schmitz.cz/res/file/molef.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e7e258b1---widowe.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072519019620---liduduvikegibolij.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1ada0ea7---33842510617.pdfIn PDF document text
    • http://hifi-markt.net/kunden/kronhardt/ckfinder/userfiles/files/19565893646.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804375755fc---punofotowuweborosorikida.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vejemasovivix.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767333bb755---48825660863.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/72802950318.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/02c1b967e73c62a49e1e4f090f230937/90894809993.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/14f194eea94d5a89b4d32717e035e150/26094877545.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/xapadedapiwasuteromuzevo.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/89308262218.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c5d51876496ea64baa822ab0c26becdf/14083685896.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ne67rnqu686m6bf3mm6faupn50/jososazeke.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f032057fd7---kunovogod.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096729216976---87034256195.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/22765918434.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95dd8f40d2---54936199626.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/23940316807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=lilly+endowment+thriving+congregationsPDF 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_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 11040 bytes
SHA-256: 2be8207380b63238529e87b383044eeddc1248ac45415770a52d9db5570bdbfc
font_01_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 17316 bytes
SHA-256: dadd0781963d3931f46e0dbb08de6f8d94f2f116c8566b0b8abfac28f5253c6f