Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8f3dd0d0c3230…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cffc87870484c37f37ac4b11888a4669 SHA-1: a8da5c64c168389ca449006f13f72894e5f37dbb SHA-256: adc8f3dd0d0c323002292bbd2f7b3bdd93239aa386d5af924d9a4e82a332efc4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of 'Password-protected archive handoff' suggests a tactic to bypass security controls by encrypting a payload, which is then likely delivered via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=online+pdf+unlocker+multiple+files PDF link annotation
    • http://notar-frings.de/userfiles/file/12942542890.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/moked.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/60186944549.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/jafuzulogarepunimovupup.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16147e5c5d614f---8600282525.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/95078688464.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161359780d2839---wojajog.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/jc4r020megtcb8las5d1h3cj8t/59154514206.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/wojapidowuvot.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tugum.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/44828871012.pdfIn PDF document text
    • https://hotelcorona.ro/files/rored.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613938238003c---25713121266.pdfIn PDF document text
    • http://szm.hu/userfiles/file/tilexijivopa.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/wiwugofof.pdfIn PDF document text
    • http://slsnn.ru/content/files/fajezuzomubag.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161447812bc36f---soxewatemimikenuwud.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/mujoluxopiwegupugizedetu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210920_040055.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/41135436253.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/12603217300.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091521502293.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161474809f3438---zopiwelozanob.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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 18736 bytes
SHA-256: ad7ad847df3262d5e1368e44d9ceb50ab1c214154a2dfc0bfcc5b33d89b5c4ac
font_01_sfnt_off00010b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 10836 bytes
SHA-256: 6eb7d565f72ef8542cd3f8630d1c06d3c911df70edbda452f4d0649a704cf0f4

Open this report in the interactive analyzer, or submit your own file for analysis.