Malicious PDF — malware analysis report

Static analysis result for SHA-256 53252541049c32b9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 09:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68194f2482e78c46f6d6c20c381b68b0 SHA-1: 98258d3dec920488906db107f9c54dcc7657b4f5 SHA-256: 53252541049c32b90d2ad72944724d90aae6661908a56aeaa770ad2ee180ce67
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=vfx+photo+editor+apk PDF link annotation
    • https://arvikabc.com/images/uploadedimages/file/nebovifanubo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jebagofadepep.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qvj5kf162jf5c3a1jnh9qv0stk/85467400011.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/vuvuparitofo.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/dekemigimu.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/winotagixorolepubexinat.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/34755498215.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/vuborabobuvawizeka.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/90738775629.pdfIn PDF document text
    • http://poliinc.com/upload/files/10493220263.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/diduxepo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/21954030085.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/89703916622.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/81865577098.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/46944434105.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/11214328276.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/81460131957.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/pariwubuzugavuse.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/89653763963.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8b7e517402a07a8462a59849090b9703/jitupig.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/5027935061.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/21642680070.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/26970380056.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3b340ba36051550403deff61a19c187b/fodubexeka.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_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 10440 bytes
SHA-256: 6413c1f5f359caae67014b378b9af991d3907f6bac10bb6fc07bcecd1f727b68
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 17768 bytes
SHA-256: e65b067063cccfbbcf6481d98c9a0c50f667d8a97730ef6a582cde7af50365f3
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1