Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bab55f3f7763418…

MALICIOUS

PDF

90.1 KB Created: 2021-07-24 16:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95638c1e80c2f7025640fb3de82d9729 SHA-1: 3709fbfba4e6aff5118b3408ec93f03a64efc5e9 SHA-256: 3bab55f3f7763418164e3213405ae133a8fcd27cd9d51114e44d1e66b1c55863
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to websites hosted on compromised CMS platforms, which are likely used to distribute further malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d7vsu9duulbdblsd3lvpsdlrfk/75327567052.pdf In PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/wofanuxe.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gefojixowofutirevos.pdfIn PDF document text
    • https://songhong.info/userfiles/file/72092064071.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/lusunoxi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5fb3d6bda6e85613b8c93845135ccf15/wuripu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kokitonaw.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/53782228902.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/badodima.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/32a3fe46cf6675db0e7aa44d65f99382/79855531954.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zewafuja.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c058214a5ee---rejoxetimikavibaratipofe.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gusupezofamojexigok.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/98444337677.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd518cb1e---nipezibatozorilo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1339d370f---vapojuluga.pdfIn PDF document text
    • https://businesslife.com/content/file/fidegekumam.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5vj1d2f3jbn8vnh522vcqa5np1/52785874142.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/240b9e677b13aa6bc24ccc6a7bd06f3f/74130112764.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/12770983515.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3600f117cf919933b563d75e935b9747/ganafawekem.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607411f902929---80157760932.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/zevuxujuwujurolepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+much+do+drone+pilots+make+in+south+africaPDF 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_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 11152 bytes
SHA-256: 8e6fc938009b9ae69e57497f4a9b7864cb47319743c3f27ae0905e53f7f3bff9
font_02_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 17448 bytes
SHA-256: 039243cdd6617bc4c63d4a0d190f3faf64d120dc5f201d1e662c0993d2809ac2

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