Malicious PDF — malware analysis report

Static analysis result for SHA-256 00593044c4dec979…

MALICIOUS

PDF

76.7 KB Created: 2021-06-28 18:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7b7e3fd85baaa180ac712a02a61ccf4c SHA-1: e99da607b77bc36019eb4cd463ead79ea42b34c7 SHA-256: 00593044c4dec979a66ad9d4557fd1215c2429cc4633446f74bc106cb840f4f2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to malicious sites or download further malware, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc666753e---65734005541.pdf In PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/zimovejari.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4e9e486c1c0d67eb0b0f965804ee029c/bojor.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/85861496423.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88469be9d9---tefubogusadanegabalizu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be62d8ee810---wosavenelugivinigabobida.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/28e2a56f53518e9afce7f5b01db00191/87062906921.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0622496a1---20187180675.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/77312de0d959abaa1b6df9a05644f467/denojegevavigiwipomexunav.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/54474b5374d61d5e0a44dfd0c6ade397/wiseromet.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/xarezenuviwo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e11c32d01d---75754781091.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/61487683016.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/benalamajijuzatesafaguge.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/63953649887.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f43a5e34a---19297967774.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/vivavedemotobaralepop.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/50518472848.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67f9378ad---64136552887.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb24c9aa1---90067237320.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/91201784241.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/53858279780.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/rabil.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k83f7k6n4goak0j0j2ajohm0v3/davoxisipaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nothing+else+matters+classical+guitar+tabPDF 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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 10896 bytes
SHA-256: 1b9335e4e217efcf0e289a4507c8159854dcef1b75732b72af3ef5bef446cedd
font_01_sfnt_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 16688 bytes
SHA-256: 80f94081541cf193f5c013b1c9d62ebbc2a677b4ec8048ec6e35a5c8e480b24e
font_02_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1