Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c13849a011a3dea…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 09:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a382019be2a6d4a57b80db6fb9bfe778 SHA-1: 9094b3d43cf6875c94e6cbbb35cd072250052bae SHA-256: 6c13849a011a3dea812dd47a7a24d3e3b733e7e284f174ee4ca4782517a14998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple external URIs and link farms points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uou60shi5j9ro4efh68sfucvrn/17762855232.pdf
    • https://moto-trend.cz/public/files/fck/file/56769533262.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac462b8a6---tilukiwitusibu.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f8e66ef08bd04a5da132807aab5da135/jinidadanonesawarepi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081478e34fdf---30358284872.pdf
    • http://versobrokers.eu/userfiles/files/23317104877.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/modelas.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/17779087068.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/cff037f7f3a96fb6d0e0b1b234c805a6/27400760493.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/89jhkvpf6a65ngvaiui5nooa7f/40139904171.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/18650836451.pdf
    • https://ludifrance.fr/userfiles/file/1309889449.pdf
    • https://tavio.ru/files/file/nitogujexofemunolizifu.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6ee39f5e20ef87d411ff5a19f7462fd0/wuvoviligililosatujuzabuw.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-25/20210625222405675653.pdf
    • https://baxsporthorses.nl/userfiles/file/lumitunagugazadubasedezep.pdf
    • http://clarksville.net/wysiwygfiles/file/xeninenigiko.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6a1339a06dedb7b4f79a69b87b7aaafb/kesavitibuwodeburupuxasur.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2410de8983---98980771836.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/3d8b3ecd7cd7a8c7987d4a59855d3ae1/soluvilaxewiramebezajodun.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/gopelidokunutugore.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/eba8793ba28d5fa8356c085527fc90fb/naziwugowaziwededizege.pdf
    • http://rheumatology.institute/upload/content/file/31436516326.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b31b5761607---7405317146.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=standard+guest+room+size
    • 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_off0000efa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 16792 bytes
font_01_sfnt_off000107b5.bin
abf64d82e054e22b0f67988ef74c9aadc3066f717911d23956ad7b306900bbf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 16768 bytes
font_02_sfnt_off00013378.bin
a3faa13b1a309e6dcae32d513a719ff9fb10ee0e1885df68b3f6c7fa8d0280a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 10780 bytes