Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d2e2c8d24bee5a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-28 13:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e735f640cee0f4e849ce131f353bf8d SHA-1: 20babababd589813bddf8a84b25f29b8d058c85f SHA-256: 29d2e2c8d24bee5a2c6a43ff0c10ecb424dc994c9363c2c744ba824814db11bd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised CMS uploads and disposable hosting sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b82a8b3f7ffda5cb1fe55794ccd7eed4/97678392639.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af38cca3c5e---8580415098.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/35be07dde7837279825a4ed5b9db48d0/12795247781.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4eae28ab---19349341890.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0e4cc70a6a270889e26db41ac5e73ba7/magumibapova.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/mugixaluzepupamelakeze.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f96946b19d0---sirizujosumareguripalani.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d9f5ddbff---wibufuwufuxaxokuxovixopun.pdfIn PDF document text
    • http://klinok-saintp.ru/files/fanatisoxegifudaxonunis.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086032e5d3a3---mukafalinorug.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210813220547.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3cd55fc26488341b8003bb44813d4a66/88433361164.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/66399449020.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/652089a358fba2a4d8389557fef9a99b/79515854156.pdfIn PDF document text
    • https://ebooksweb.net/files/file/61955355679.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3fab0c16aaf4a82c45b161892a6a00da/zemujuwarunanemuj.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/guvilofopow.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/rupasupu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f67281fdb---74468222052.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/644emcceno1j44j4nb8dejn9f2/gadajewumokivo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9267bdfc---wemolu.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/bawam.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/98edd431e150a0aba35a04e7677b7366/pekavesid.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5908e375---junakizale.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/25326722496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=my+first+ever+roller+coaster+ride+igcse+answersPDF 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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 16956 bytes
SHA-256: bffb1aeaf2de82f090a896fd59cc09adef126567b529f7d6425a4ccf5cc8da86
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10908 bytes
SHA-256: abf9aa6dc26204052a5bdb42d79a8751d156017041fa5d325e8f2cd7e555e90d