Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb648fde8454df2a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 00:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f206e9f7522844ec62b387994ea4e6c7 SHA-1: 16edcc7dd68bff67e2a23b402660b404a5702810 SHA-256: cb648fde8454df2aa84dc77cb7cb12db66f7919fbe02be27034649ebf4863ddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised websites or are hosted on disposable domains, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://taiwancy.com/app/webroot/userfiles/files/67631989207.pdf In PDF document text
    • http://isotech.si/uporabnik/file/72160258195.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/41787479176.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fobeb.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/10210405189.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/12813185067.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/3216054168.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/21365615971.pdfIn PDF document text
    • https://limsurdua.com/contents//files/66416386181.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/29234256460.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3n5gvig4nctvqlak3vcdll56ql/rinane.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738a4f79fea---9986249165.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890985edb30---15705455326.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedba2a18d---87221305624.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/xiragevetovisigidif.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca97e24e0af---bewozodexudoxasamedeg.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/jemijaledira.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6cc45e38---gotuwapebumuzowodofoxizun.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f448ebb19a---jeroxizifevutarino.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/kuniborosonigevodezis.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/javuvalovonaguwewafuvujex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+roller+coaster+parks+in+the+worldPDF 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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 10844 bytes
SHA-256: 6794e4935ba9cb6fb329be838653c20965a8f5cefe4d24ad41d7f9d2b975c32f
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 18016 bytes
SHA-256: 248d3544060d5ee7cc8f54a71c1c83cde2a14a78551ab5ee2855291ae3289dda
font_02_sfnt_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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