Malicious PDF — malware analysis report

Static analysis result for SHA-256 19300de9c439f346…

MALICIOUS

PDF

79.2 KB Created: 2021-10-04 18:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d62bd94f8b118ec9851ef42fbe510e1 SHA-1: b13604fe62b63e183e19bf849dcc2917fb159520 SHA-256: 19300de9c439f3464088488baef7f1f76b49b3ea782dd1945f394daace01a1c7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The presence of external URIs and link farm characteristics points towards a tactic of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://cructi.ru/uplcv?utm_term=how+many+skills+are+in+skyrim PDF link annotation
    • http://cosmikkino.ru/sadm_files/16304999857.pdfIn PDF document text
    • http://zeci.nl/im/image/kubukurivadora.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210913075832351.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/kuwebesefikudulepebewet.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/5442223367.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/dajijuxalizukelop.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/58921275914.pdfIn PDF document text
    • http://kids-ex.com/images/blog/file/34121837327.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/19361559034.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614745ea4c591---woted.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/88513440790.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/74086558614.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f92bca400bbdc7460c416343dec13dc8/jikuporolomavalugevuw.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0gocj73skqfghbabasqqlmm4rj/40174355210.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3f3aef466a70e94e111c0289af6a0a34/setokiri.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/voxek.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/8110745653.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/80846351565.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/javugesunemoxe.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rq67541fsjm6lm8umto8ocou66/66206603884.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/mafunugegenazuwig.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439ec15bf4---nananaxinozu.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/49819283003.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/warilawidaxi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/51298950617.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155679a77d4e---kedonowepeseseg.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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 17564 bytes
SHA-256: eda23473ed5b54b17242c491e69a202d2828edd368ba9cf48cece359bfc2dd8d
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 10452 bytes
SHA-256: 3eddf623d5a40dffca1e2de131940c497284077b68acfb6756c1c1cbe11308aa
font_02_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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