Malicious PDF — malware analysis report

Static analysis result for SHA-256 659bcff842144170…

MALICIOUS

PDF

85.2 KB Created: 2021-08-20 10:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9af4a4dce7340395a4b5df4fe109982b SHA-1: d1953be287f0afdbb90d9f2fb6d7f9c960787c1b SHA-256: 659bcff842144170ec8fa37ce4eb64a72b62468c1b204e629d683cac2405be8b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58a730891---68048906792.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f5a27c8688ac6ca10bee7726d28bc018/tizadiku.pdf
    • https://csodamalom.hu/files/files/notirudowozujumasidaluve.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/2ac79881ceae53f96897b7b5889d3b4e/63289743773.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b03a35542fd---125834607.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114665562de9---50543805141.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b4b7d3e8b9c3723b41a4d2ef58b5ce4b/23022392802.pdf
    • http://h-st.nl/bestanden/files/wujekefadevemozizas.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4d1ed92ca67bb870d03bf00e6d7bdf84/11163719911.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8d21095bd67ba2a6e99aef4984df2216/pimiku.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ad45103b8a0dd39701c436708a3c732a/gasegovolizikoxopix.pdf
    • http://adacu.org/userfiles/file/20210805153304.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7c1282176000414b83266c947fe3812/vatomamowo.pdf
    • https://easypayindia.in/userfiles/file/95924400445.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/sjvu85fd1rs3qgqj7hvidbip55/83702694810.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ddg9jldc8jnck0j6fkn3obna5l/84893377777.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/90q7auvlvhuae2ijls650ad509/69196205623.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25cc39516---gobepajununamozuromo.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba99c2f0c---subosatusezupalura.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/64735b05f0b177edf10e4dcad9745c54/31372061499.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b344e5f447---wujixipukumurexojaw.pdf
    • http://mid-europe-ex.com/images/blog//file/lamexukot.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7r0i1hl9378dt9lota4dqvlet7/35497597512.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+can+kill+parasites
    • 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_off0000eb3c.bin
64c1c1ae79907d7c0c9cddb18d4f7c39c9a8e77297b3acc307e8ec4291ed63fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 17084 bytes
font_01_sfnt_off00011782.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 16792 bytes
font_02_sfnt_off00012f99.bin
253d96a68c3fbf19a3776a27736b672f13c584a3ed490fad6a49b03c9cdb187a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 10436 bytes