Malicious PDF — malware analysis report

Static analysis result for SHA-256 714b65ec6ac414d0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 20:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd676c06227ad7dceebfdb0335ff250b SHA-1: 5c30c196ccc8ecc25d2f8318cfac50864230c6ff SHA-256: 714b65ec6ac414d07a1939cb8ec30ff20a169a3322d82c1cfeea0922cac1d58b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://fond.ru/userfiles/file/95753945996.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tri288bnt80bijprmnj6b5koj5/rigamaxit.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/riroben.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/xupobozekapojorexif.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/60722570742.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/66931545363.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/dudop.pdfIn PDF document text
    • http://lejuriste.ru/files/file/59307704323.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/nifetufogogogimujorubizo.pdfIn PDF document text
    • http://kaies.net/upfiles/2109092020375015700ta87f.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a1fb504e9aa345313fe4e436e76e4e1d/1476241966.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e95b0fe8---wasezozeperagowobofexox.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1c9835bd7a7dec60b57de8c88ce08c46/80200883803.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f408bdf5ec---24459062588.pdfIn PDF document text
    • http://mamam.by/upload/File/file/fisugawijegexes.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/durawaremovuxawotu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8447e627e---26618066953.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/99674804066.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/81198272465.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nobogubenitagef.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/pibuwixavorezuverujilak.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/37987818730.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/nopedugumanokagerirunifej.pdfIn PDF document text
    • https://asken.as/bilder/file/48730569649.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zosowesirosabivonevunedu.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/sexazegupagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=messenger+video+call+and+chat+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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10900 bytes
SHA-256: 026b0d4c1a71b3dabf231e3c9588c1f5f929ab5d9c0bf56096c574736357ea95
font_02_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 17812 bytes
SHA-256: a35c8a6a4e0f832c6b535ac889ecc8d59a4b0eda5b05a08c4c897f3983e2c80e

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