Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84d0bf14b7a03af…

MALICIOUS

PDF

97.4 KB Created: 2021-07-28 07:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7977df2c04cc67a2a5036ee30baffa73 SHA-1: f342376516a523b5dfbc1e4a284c1861bcca01c9 SHA-256: c84d0bf14b7a03af5a88d8d3b20c18eb245794c79e1fbef2cab8247830842735
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or distributing further malicious content. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://adaviestransportltd.com/userfiles/file/1207427478.pdf In PDF document text
    • http://flexicourse.cz/res/file/tezilufulogiradi.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/8372978763.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/52b627507aece4e433f18adb2635ebc7/19494857289.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808198705b0---63575539144.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/6116753467.pdfIn PDF document text
    • https://rjpexport.com/files/vurinudipavitotafipa.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dpqf9d7j7g9gmvbnbvk89vo0o0/3099237142.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/wonuviwiperuse.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb931536f---62298354613.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160761931e72cb---jibasadijekenar.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b519870a43---jinokidogemuxejejo.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45651923369.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2900a52f34---27693052863.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bn427vg7375nt5ftraa6n7fje6/97484567255.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/tejemujowekidavivodile.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160deee9c61114---38790141631.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/43070879321.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/19985265074.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6878ac969---89772169148.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/gisizakuwiladi.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/jozemipem.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727d5b11b45---7370327568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anjaan+special+crimes+unit+all+episodes+download+480pPDF 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_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8E 11380 bytes
SHA-256: 33d43672e21d8755bc484297348329e41047bb176ab9123f0d6d7e6f16d12b6c
font_02_sfnt_off00014871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14871 18048 bytes
SHA-256: a0b0239308450560bb313b1c67cef6100a52281267ea9585beb76059195b5fe0