Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7dd07c4c0038c3…

MALICIOUS

PDF

105.2 KB Created: 2021-07-04 03:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d44e00d5a90e7dffa435971c75107b0f SHA-1: 6123317391ddb0c9c770cc03e07c276db28ffd74 SHA-256: 9f7dd07c4c0038c3d75a57a7f7bca0c58e9070aeb4cda2a186855c34221e21fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://sns.hu/_user/file/tivowewo.pdf
    • http://itkaufmann.com/images/fckimages/file/kivijijovikuzuzavi.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b8a30e91b7cd6d1f3314c127e46df75b/46652767246.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb76a186bf6---4847474389.pdf
    • http://acecaalcoy.com/userfiles/file/76214109060.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1df1acb78a---nuxuvalo.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f93deb2808368e837272ba7a0c67df01/wekojo.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74d336074---getopoxuzijaguwaf.pdf
    • http://www.jindatunnel.com/up_files/file/7305006015.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c31cecfda20ce131ebd32abc98b29aa2/8636822088.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c94502f096c---18530222977.pdf
    • http://wujipacking.tw/upload/files/sogopokapomijetul.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d523ff0999---gapokit.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c13d0e62d---mexopusa.pdf
    • https://mygo.com/ckfinder/userfiles/files/67718942390.pdf
    • http://mmdplus.com/userfiles/files/20210611_035239.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92e65c05cc---nakipagabunowamilararuz.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7413a40a---fabaxevelugesuze.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/51722432570.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4b1ee7f63963e5c935d6f7f7f566e1d8/tevunufigenoxugekadelod.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1tonmoh99tj5jq9b6f35fk0nrp/78461214864.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/96ced6e760bc80aecd25111fabdb84a0/woxoxuwopemonemopasemotor.pdf
    • http://jtour.vn/userfiles/file/78388733174.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7e7772a2---93054035683.pdf
    • https://thaiwoodengames.com/files/upload/files/ravaxagujeka.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=swing+band+instruments
    • 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_off0001382b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382B 16792 bytes
font_01_sfnt_off0001503d.bin
88b7931214477eec270b73982c1e0521095783fb0d10ce3801e753c3ea0225ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1503D 17604 bytes
font_02_sfnt_off00017eb3.bin
8a23f0f164deb14c77340ffeb008534764ff065cc5623efbecebb09af6c287a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB3 10828 bytes