Malicious PDF — malware analysis report

Static analysis result for SHA-256 4624583e45817c05…

MALICIOUS

PDF

83.7 KB Created: 2021-07-03 11:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09cf729e9fe1e996f1adfd24ef5cd26c SHA-1: a2144d0982cfd14f112e7d8170c5d5520ef80276 SHA-256: 4624583e45817c050e56c4f7e4c3aedd9357cc82c151ce2c15829f95a7454277
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear textual content, but the presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to drive traffic to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a933ee605---buranumalunivusim.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/vakeru.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/foxalomitokesuzipenep.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a795aca674e---52093426697.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6957910bee---pobojirugadefodig.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3898a59ae---kusupavaredor.pdf
    • https://bravo-hk.com/userfiles/file/texijo.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba7c92df2---96754218428.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/raxofipivawuxerusos.pdf
    • https://btegypt.com/file/ramemunokefodaxila.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ug8h2n8j8ed0d0kvikat91mhkn/49215148250.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607208194ba14---6844519069.pdf
    • http://valdhans.cz/userfiles/file/wozudadujujujomiku.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf0958278---4713000135.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c07156d9186---34476586598.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d93df3b3e0f---10930362862.pdf
    • http://kurpinar.com/img/userfiles/files/xuropukesipugezi.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d10918c8f3b057e42be8864ae36f73c/tafokofexekumakeliz.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607997f57bfaf---saluziduxumezunud.pdf
    • http://shinies.ru/img/lib/file/24634162520.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84069655082.pdf
    • https://ngusacdon.com/upload/files/ratofilodigukujuzow.pdf
    • http://progfin.pl/userfiles/file/ropub.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ec8779c8e7f3e7ded95c768a9c2cfebb/47017049360.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+ship+something+without+a+return+address
    • 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_off0000e279.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 16792 bytes
font_01_sfnt_off0000fa90.bin
8cc190ff3253dbb567f1fe3db18983e3fa569f84b9ba51112f0e64f88fd4ba4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10972 bytes
font_02_sfnt_off000113a9.bin
a3296bb51118ef07a3cb12ba40b97c941c7b846fa80a18539810fc8326de73a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 17340 bytes