Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5513479b4d0d03…

MALICIOUS

PDF

99.5 KB Created: 2021-06-25 17:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e156aa3be1ab4534fdf0079ca1f4b8ce SHA-1: f6f0f0e4bcafb1fe4f7f4ea7736e3d1a87cb7c28 SHA-256: 2e5513479b4d0d03107c806737d5688f4dbaec6492bda29e41cf947febe62e8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tedvandergulik.nl/userimages/file/89943665544.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/b7c0705ac790d20f69f7a285f02dc9a1/waxudexataxuwiweloliratu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66bcc2f35---10591949205.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/96e6f9035e25552428f26ccd4394e251/lepoma.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8ua9fbkokh7osjvd1tc9gnnaq6/diwepix.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9fec32necc6sgaaf3qf1rbe7c3/92591359684.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/88976766210.pdf
    • https://agrimal.pl/userfiles/file/xibetebaxegugozape.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6d8b62e342bc962d84b1dc06fa9d82fb/41385484812.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/785585b80b5a391bac848ac72e69a7f7/27268946588.pdf
    • https://wittnebel.dk/file/juluvufovufululij.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/15555343719.pdf
    • http://menafundinfo.com/userfiles/file/78061319394.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099739cd820f---baxavivag.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e99db701---390233449.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d4214fdc07cb9e1f7e8214d6f1eeb9e0/zatuxor.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609727250ac25---93809603230.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tpi1hd79r9un56q132cr5hbf0r/modixuxomarakidefawipov.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/ranub.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v102ok155dscgt0gsm7ttqnms7/80615633971.pdf
    • http://singlesync.com/userfiles/file/gomafufazulofiwinirol.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dcde407c7---78551750495.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ejgfmjehtdfk6ho4k9ldpl1s67/60226093587.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b28356c9f35---rojekeduvaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+oblong+box+poe
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 16792 bytes
font_01_sfnt_off00013aea.bin
650cfc1ed6d9a9be34ea78193069027fc1a0f574d6bdb35576b27afb610a8c29
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 19828 bytes
font_02_sfnt_off00016a90.bin
277bf052f402fec537acde4586ecad894a86bb48ee1a630e0e150cb81817912f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A90 10116 bytes