Malicious PDF — malware analysis report

Static analysis result for SHA-256 175d7dda25b69a2e…

MALICIOUS

PDF

115.5 KB Created: 2021-09-02 20:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9b66647cfc9f44a68dad12d35ba8aca SHA-1: d8490582ca210a5d838b1df85cfccb0653dc3ab7 SHA-256: 175d7dda25b69a2e4fd6302e3b9c4d255a8122f94931c9a0ef8e7a15a5328f22
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing form builder plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs suggest a link farm designed to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a09304018f0---5852120266.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/puhu8lo6pucannvcu67u7hqqmh/26403277846.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/29051513579.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/734c63e0b49c539dc3689c6f0ffe2cee/23001343353.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb539c02---27118714191.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kt23t79rpkn2h1q8nne2fvs2dt/rikegadatani.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gazinatukadazo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c2f352436---woluvesodevaxufoxer.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/4592793104.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab50ff5aa1b---37152294688.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/85549970507.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/zunaxukezunasunizapuridaw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e839b1ba5---45261940097.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/mojibajopunenaxogota.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b749a388c40dcbcabef0dd4be0b90cbc/24759493019.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/96690205871.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/26396114717.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/498259ac73963b756880adac97df360a/32753676954.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/69336070942.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1h654bp0ta34ldj06du3vtecnr/59961892646.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/zafiri.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/89610623985.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/98951551414.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b8f4e516b060dda22e64ed9b3b1b5527/18242857351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=teachings+of+prophet+muhammad+pdfPDF link annotation
    • 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_off0001591b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591B 21520 bytes
SHA-256: aa5d3abad16232d19d44cdbaafebd8130461a64acf2bf07151b620e2419c4e71
font_01_sfnt_off00018e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E34 11084 bytes
SHA-256: 0e57dd90e3b7996c6fc081486b53f7ab308acc37896c164772888a702f2e6052
font_02_sfnt_off0001a7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1