Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5b2dbf0583666c…

MALICIOUS

PDF

92.6 KB Created: 2021-06-26 01:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6353aa7b7dc3d198969b0b180e06a270 SHA-1: 8b33e5365cb0956859805c5d74bcb067a1bd33c3 SHA-256: 9a5b2dbf0583666c13b90555c7dc3d8c030ec3620cb67d8af2b957e762ba0c42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of embedded URLs point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0c93d8cbeefda8aef71c1afa592870d5/suferosinofaz.pdf In PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a2deb95f0---vukefuka.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089100542f10---29229002615.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9f8ee53538318c38a68352bd46721e60/torin.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9821a68e---69724239288.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246efd1386.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/66090609427.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/viganofutad.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7b93aadfe---sutubum.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c95e65576f7---kosejibopawin.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c71ad1642d6d2f98d4340c362b98def2/zozepadogipuladizufo.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/33534826295.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7be19d15e13e844b0b30973cc31323fc/zubow.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fa2bbccf9---46561636193.pdfIn PDF document text
    • http://pronobile.de/catalog/file/44177243845.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/lexoxurupobu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nobiroxurigofa.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5169c432f---22646113731.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/987658d8a0ccb5e5ecc12a67b7c22e1e/99358561791.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tiwoxeriwites.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/459a9774a57537126a6bd1fd308d9baa/gamefoniferi.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/80942354a00fa5de63055066d5aca652/24902114771.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f61d1d176---97610856274.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18d68ddf30---34119679981.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55c4570bc8---60386805654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=simple+weeknight+recipesPDF 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_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 17852 bytes
SHA-256: ecff2e86978302a6730849a8edf83e337c5fadcc87889e9418e4fd45c1b52c27
font_01_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C88 10792 bytes
SHA-256: 31a1886890bce86f66755770c05c6a3e5329459965c67b7dee833d2529ef54ee