Malicious PDF — malware analysis report

Static analysis result for SHA-256 d874dfcc576bfa32…

MALICIOUS

PDF

96.2 KB Created: 2021-06-27 18:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3902ce2d28ea93557fbfc1a0deef577a SHA-1: 5377571caf7ceec7ad4c06e91b262f1d3d99cae1 SHA-256: d874dfcc576bfa322d6c2aa638a28b0da13044c373cdd15bf2d5dc7051a4a309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its purpose is to redirect users to other sites. Several of these URLs point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f56965b594bffe41aa30075ee12eac69/52876499863.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/susux.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621811462.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b227fi9929u0vr4613crmekrom/67838854930.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/49179551714.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8647353d5---zijemo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ea4d6b947bd0777821af5bc41c42bdf9/79892586086.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/17ouqgr51mubb3h23k63nlve75/xuwekugedosizoxezefivetex.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/skeg0a2i2qdds63i4g8f6b6vm4/kasokiz.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/dujuletit.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/57309018516.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7756a2c3c---sepasadebixateno.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/70120505451.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/7d2o17uflv8sdps5g5pjtht4a7/rumasaxaj.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b0d47fd34---depigejisatapijode.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/62778916448.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/90709392279.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf93979a6e0---pekex.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/c8n9pfnjd2hc5dvd7vt79150u4/sujipazumopukunefekon.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/91eb6e5383d5ded2d0ad4b0431dd9c69/84639204712.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/fizogufosiru.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e34bc5cc1eab5e3318e83bb2dfb452fc/xutewivabuxudevuxapexo.pdfIn PDF document text
    • https://activepymes.com/pub/file/davixatavidotato.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fc5dbb0a4b0e690c65ba4efd296708c7/vuzorodojimunepa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/eckitsj79km4mp7k64tau2pm8e/nejisixumamopifuxavo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/u24i8t4iq0s49glvtpufitfj35/tuxirapom.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759ff1da434---sesuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=county+for+puyallup+waPDF 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_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 18840 bytes
SHA-256: 58fcf927ec354658f3ac32f0453b131b65aa9e30107bab45aad14f8b63548f5c
font_01_sfnt_off0001440e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440E 10292 bytes
SHA-256: c6ad9a231a99212560ff5ca76cec098a3a03a3b8682350abe6eb8cb2425d56ef
font_02_sfnt_off00015b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1