Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0398f0298204c3b…

MALICIOUS

PDF

90.9 KB Created: 2021-08-08 16:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f735b7454f94e9eeed3831397d03427 SHA-1: 52e3845c931b1e39cf2df7872bc649a7b44c4043 SHA-256: d0398f0298204c3bf3713088fb147c1cb71076d7b4b1e2ce9e3b96cbc88b676a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=how+to+start+speech+recognition+windows+10 PDF link annotation
    • https://mariapolis.net/ckfinder/userfiles/files/97432843959.pdfIn PDF document text
    • https://mytopics.it/uploads/file/peduxasabula.pdfIn PDF document text
    • https://ksboutlet.com/file/files/12689088429.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f588af90---wojubutufaxokal.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56173e781---78545360526.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/74dcb45bd0ad2384bc1a32ed2afc3879/1243576740.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086690289c8e---53776974429.pdfIn PDF document text
    • http://agrion.org/upload/fichier/43995331423.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/geginax.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/fepijabu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701930c550---tesasinoruvubus.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/38416480690.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/parobutilowazirixuni.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sejuzufakefavikipamidel.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/98560996201.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/bijezaxe.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/mutewewimujob.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/xezolejasumakisanikezevo.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/26018389673.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/lulagito.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a9191de068a3a4148308540bb2f313e3/resuvowumovavetomosoti.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9355d66544a86bc40879af004cf5dc20/tewaxexugiditutenix.pdfIn PDF document text
    • 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_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 17424 bytes
SHA-256: 896b1a0020ba1cda21329a0287ce3abed20235ed988d35bd26419a07e393dd63
font_01_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 10996 bytes
SHA-256: fe0e3b659c30628fd856150a9afee14249a6c48a97594d9a40539dd21087ac53
font_02_sfnt_off000144ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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