Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22e3e8056085d9b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-11 19:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 748a4c06521d2785ff57937ef9916944 SHA-1: 1557bcc2d8cc05fddfdcc26bbd049d00ae69f562 SHA-256: e22e3e8056085d9b5252c06aac292cfdef6eee5c23073b3f0a2371eaa38a92e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt 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://crysiq.ru/uplcv?utm_term=words+that+start+with+q+without+u PDF link annotation
    • http://enjoybowlramenandpoke.com/uploads/files/diwiboro.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0dafd205c---77815354753.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/kulirokigazetasiput.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/95435599348.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/posafujajukidokogemuk.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd19805f7---50137483348.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/wijadororerakelukokusam.pdfIn PDF document text
    • https://lecachet.fr/docs/files/labegezegeluk.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/20477757741.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/donupagusozesenig.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/gororev.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/garinugugijenetenatug.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/nagewesimusewisejitupuba.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nf6s3g7rf3shmvbou147ipgss5/sanazinezona.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cba80a37f7fe022919123205720fab04/91178990243.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/kuwemi.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1bc0f4f---26420517955.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/34655007833.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/84361063446.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee6c9ede2---zelidepe.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/78218221559.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/39030146264.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7f1dae06---13215012613.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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 15896 bytes
SHA-256: 6d5e59e6fa07fc6bf2a330272b55cc1eed699a0a5c2c79f0a71deb6ad8a8ac4a
font_01_sfnt_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 10388 bytes
SHA-256: 73c979b4ab806c1f6f9d1d09eb60597af4612c774f479df0d7b895822e4c65f9
font_02_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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