Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0cfe530596e496…

MALICIOUS

PDF

84.8 KB Created: 2021-08-15 09:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a44607dd6026de09e83d2547184cdaf SHA-1: cbf332216f05a77c8a6e2efdbb4b1ed1af54a50d SHA-256: 5b0cfe530596e49612351ebbab65da406c100d48a7ae2df356d3852ff8c2d6e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9576ab4aa---fefavutito.pdf
    • http://owv-sad.de/userfiles/files/77767745962.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/f65s2rckhs18jbh85lagballnt/monekudu.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fec8cc691---45241111007.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/vebifotanejozukinotod.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3766bb1e---womofidinovukuwaxaru.pdf
    • http://hiace-yoshikawa.com/js/upload/files/juradezimujofikekusafefif.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db59771054d---wigibaliziwutogig.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/neakcajqrp22krbt9bt37thgef/timutox.pdf
    • http://amsaneeraus.fi/userfiles/files/4488074173.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160badc23a6b32---revoranomiwodesisirade.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/14125530116.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/mevuwosabulodaturebule.pdf
    • http://gotween.com/userfiles/file///buvowo.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6e7d2364bc3b9f636c423e0f55822365/zulafez.pdf
    • http://ketoanaca.com/uploads/image/files/lazebowud.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/89e878651025e8d5b296bc44e5fe712e/14061276723.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gatedikabo.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/nenudazowatedufop.pdf
    • https://birudongker.com/contents//files/zusiborexupa.pdf
    • http://beiwendq.com/userfiles/file/22413370183.pdf
    • https://aduanaldelvalle.com/userfiles/file/kavesupemuniwexoje.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d4986011---xatavokibanobakonejika.pdf
    • http://aplus.to/userfiles/file/94823228332.pdf
    • https://goldenapp.net/file/suxifolazo.pdf
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/godibererisowuzanevosufox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+learn+machine+learning+with+python+free
    • 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_off0000e719.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 16792 bytes
font_01_sfnt_off0000ff30.bin
4c23fd3ecf2dcffc7ff0b7cd141992c98cd03c99fccca99ddce16b991158a302
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 10948 bytes
font_02_sfnt_off00011862.bin
f1c4c3c76d59178df5bf88711d84b8db58513a6cb741a62abf95788500bc66a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 16928 bytes