Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee793804a8e0a6c2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 09:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccd38324339d93602bd619a0d7768f22 SHA-1: bc2400bd12533916dd8e6f5b24ee90cec477c4da SHA-256: ee793804a8e0a6c2d11e265526b4efc13df82c4fce0b25abfbfc8cf5522d0a11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=n64+roms+for+pc+free+download PDF link annotation
    • http://citadelcaralarms.com/userfiles/file/dodawusibokuzoxifopuwaku.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/86357903059.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/94141076780.pdfIn PDF document text
    • http://sparkpro.lv/content/file/xodemakutokuvekud.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/vofiguraz.pdfIn PDF document text
    • http://strap.sk/uploads/file/kojozobexulonixigos.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/zageke.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/futarusasunitoravade.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/95245660032.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/goxifosow.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/pogorodezikeke.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161418ccb38667---zonerepekolavemef.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326fbc291d3---xoteriwuvagotebatagadedad.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/92288457561.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/uh81ik8j8l7ifekc0upt3ta6r8/kesipugu.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/tobefakegixotag.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16141148e0dd64---25797006942.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wexifa.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a914bbc089---51273953051.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/wurupelatedukixomejajuken.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a6727ba9ddca00902c4d809f83bf6466/11404621092.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613280fa1a14a---59824192993.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/suworotabasafo.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jatitenelerabapibaju.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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 17628 bytes
SHA-256: 050b375abbc080fc68ea1be8a7149fd30792f58363c6eab8ed31dbf1e488ef9a
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 10900 bytes
SHA-256: 217dbec82a936fd2ef8be6205210079e02107939e61fe8c61231f9cf647941ba
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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