Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f24f8097b9c961…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 11:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24240408e3d1a90643933a08acccb4f8 SHA-1: 34b86a6998ebccaa5b135a3d5bf30661cbbd7ea8 SHA-256: a6f24f8097b9c9618d587bd406e88e20fdc13840a97c0357c91abf1081abab84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ve3ev3ur0m8jaansq8p9nb26pt/tugokalusisagerufupef.pdf
    • http://centrlita.ru/archive/image/file/babofexokut.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/de13ebcfe146bf5b8128c36f0d1253db/titifadopufo.pdf
    • https://buyafranchise.org/files/files/jobudobitukitu.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9d8d30560f4783ec4cdfd958b195e166/wuxejawebivopedonev.pdf
    • http://abwva.com/uploads/files/lemedoledaxifa.pdf
    • http://carrozzeriardue.it/userfiles/files/14457281152.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/m6drf95ag1o4h0p91s8kn62bh7/zinosuzuzeferunine.pdf
    • http://tahi.hu/ckfinder/userfiles/files/78793023.pdf
    • https://aksusu.com/upload/files/mativis.pdf
    • http://amsuatrust.org/survey/userfiles/files/divofasaven.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/9912471426.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7e404820---37612668534.pdf
    • https://zegabilisim.com/calisma2/files/uploads/pifejujex.pdf
    • http://tangneylaw.com/admin/images/file/97836207714.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/wokubuje.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a790847a9df---rabebepugatibopuxex.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k9s9870jbdog05fdbt4b8i7le9/34078920768.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/99226694772.pdf
    • http://dichvuketoansg.com/luutru/files/rowixikomixabenopuwit.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cryptography+engineering+bruce+schneier+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d8.bin
91f1c4e1d260319a8d5510ab710f4a25028d89b30886809130a3caca007acb7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D8 11240 bytes
font_01_sfnt_off0000dcc0.bin
5397e44725b34d5a9f7847ba5f3d0608923a2f5c612a687f1b19c0df0cbc6eba
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 16888 bytes
font_02_sfnt_off000107f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 16792 bytes