Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c39a9a1913581e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 13:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 634b933545a1f1f011dc872f99177583 SHA-1: 2c7ec3e40998bbf29d3b0701e609d894ac11c2e6 SHA-256: 17c39a9a1913581ed47c96b272d57ef557369bd5ad160494fb9f50106ad07248
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment, indicating the file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kawanmto.net/contents/files/80320522576.pdf In PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/29181096999.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/sasetamebeb.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/89668496975.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/vutidexademuli.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jrluab4k1me7a4mvl8tjus43k5/davegazewo.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vunewebinege.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/53120448793.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/53434997834.pdfIn PDF document text
    • https://satesayap.com/contents/files/xilib.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/99560282441.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sikoxitadisunawefew.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/48130113144.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/85025417649.pdfIn PDF document text
    • https://campermagazine.tv/public/file/pilufeg.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/53696335072.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/fasagexa.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/pudexeguvasuliziku.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/tizelaxep.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cbd7e5af00b459220a413af8d2722ac1/govogajozanako.pdfIn PDF document text
    • http://poorclarescork.ie/images/difokujupawujojaja.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3eb6823fa---43326877501.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210907095620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=purple+hibiscus+free+downloadPDF 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_off0000ca94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 18584 bytes
SHA-256: 2223433246ab117cffb18f6d3a644a6664fb0f82a13fa7258985d781fbdefe48
font_02_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 10944 bytes
SHA-256: 54d3c6ca681c73fb6235556a48bd875abaeae9ec8f32e87424dca1577dc49291

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