Malicious PDF — malware analysis report

Static analysis result for SHA-256 66be4969ee85741d…

MALICIOUS

PDF

86.4 KB Created: 2021-07-07 00:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1ecacacde753d98624c6b258c13d73f SHA-1: ac105f87e9d3224cd65c47a1813a8a0f7fe40a84 SHA-256: 66be4969ee85741daebfdd6a1a32c9fd93eaca56061e7713af5c5eda97d146f6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crisismobile.com/ckfinder/userfiles/files/fejajejegeferipolugoji.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0ae2b23d---62271379827.pdf
    • http://candientuvibra.com/images/file/27912531998.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/399d45310cc4a58638ad7278b0769b9f/mopadakewado.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab9f70d3e---32332121229.pdf
    • https://theatresaucinema.fr/uploads/file/62474106581.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/juteberusosaz.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609271f362dfb---11063601811.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/997e15bf08424810858fcc3a16bfdade/98076060248.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/21287883856.pdf
    • http://jkbprivateiti.com/userfiles/file/42903137081.pdf
    • https://rent-1.es/ckfinder/userfiles/files/34636384956.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bq9vfi1b3ukg0btitkq8ktuhc5/wuxolebagobujupelad.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a5b28df4c3b0d75d7c95f1ea8afa0235/zatapumekufavazokezafu.pdf
    • http://teechart.com/uploads/images/files/52280264569.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6f955097---41612578165.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb0f41000---dabijavaduzitosev.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/pd22bbaomtqmo20rs6erurv504/fukoxirarut.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b1992339---24586584097.pdf
    • https://weeb.nu/userfiles/file/73268690096.pdf
    • https://rybczewice.pl/userfiles/file/11377097922.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160825eee716c5---podaduzetupiwagakuxusesum.pdf
    • http://arkystudio.eu/userfiles/files/88198152543.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160767704ac365---54788539401.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=middle+eastern+chickpea+fritters
    • 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_off0000ee05.bin
cd9e193eb1ca869e31b0ea7a89d3cb5df827b235c71dcf7eceaa6da992e9ed25
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10680 bytes
font_01_sfnt_off00010666.bin
835917d823e95d6a220c979bb7fa311c5245ac3cb2a376ecaee56674c55bdeba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 17612 bytes
font_02_sfnt_off00013477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 16792 bytes