Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b8d444082ec5bd…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 03:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b348cb395ee2ffe7d3245adabc48fba2 SHA-1: 73cf0ed560fc03aff6b3cfe0214d1a336fe715f6 SHA-256: 29b8d444082ec5bda9ccf7c2f96ce6042a209d7ae955565714188fb7caa978b1
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external links, with several pointing to compromised WordPress upload storage, indicating a phishing or redirection attempt. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of link farms and compromised CMS uploads strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://marathonlaval.com/userfiles/files/6055412197.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/92057147734.pdf
    • http://luckdidea.com/ckfinder/images_store/files/jirewajolirojafewiripexov.pdf
    • https://tylbm.com/Upload/ckeditor/files/likukevivumezo.pdf
    • http://camonetinternational.com/files/file/dunevowus.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/29194534345.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/8914662526.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e350329e53---4822226255.pdf
    • http://bawaconstructions.com/editorData/file/wapuvegevikonuvokovore.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161060dd7aeac4---wopebajeraxevolexin.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e3d70475af070ef18adc6bab7e581e91/bokenopirupewolela.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/10862734992.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baac4e1e03---78855659211.pdf
    • https://secolink.sk/userfiles/file/86856843235.pdf
    • http://chukgoobok.com/files/fckeditor/file/mamixozozipanozema.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/48975340041.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/u4qo31049ddqgjpklqinb99g6m/8112055606.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6fcd816f799f233b7d716cd923cb997a/fimogotufapetumu.pdf
    • https://stratasphere.online/userfiles/file/muzatonojek.pdf
    • http://happy-land.hu/editor_up/27015990026.pdf
    • http://busankid.com/webfiles/board/file///wenewanibewuvimozosofobu.pdf
    • http://22743333.com/userfiles/files/3705384527.pdf
    • https://auto-rujo.com/images-editor/file/32974951726.pdf
    • http://technoculture.cz/admin/upload/file/xejodulunijax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=does+dehydration+cause+low+heart+rate
    • 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_off0000c522.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 16792 bytes
font_01_sfnt_off0000dd34.bin
b6128cb6cb507106f731c5d1d518928edcd9dae157e57ab3872c6ee1da45069c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 16708 bytes
font_02_sfnt_off00010827.bin
0b946513546c08f72481ece80718ba53f25e311bb5fa63501e4ccc625f1a81c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 10768 bytes