Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8959ba40dd3aef…

MALICIOUS

PDF

98.8 KB Created: 2021-06-19 23:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51257fe72aed45ecfb9275ec0c0b1c08 SHA-1: 4ea1e1742f236d6c5fc9c70e3aa99be1cc27f5b7 SHA-256: 8d8959ba40dd3aefedda335dc17e9e19eb39b199911ee50b849a256169544c2b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure of downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21121c4ef---ruzolidusiwojuvigejigave.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/zipezagofal.pdf
    • http://firegallery.ru/img/upload/muwixururafejexas.pdf
    • http://www.deopendeur.org/imgUser/file/padil.pdf
    • http://benevolo.it/userfiles/files/27202434668.pdf
    • http://sportgalaktik.sk/userfiles/file/89555471199.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e2b3c265---vagevat.pdf
    • http://firewheels.pe/userfiles/file/tetovamelifuxi.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/af65bc62c14560fd34e9794f858adc0c/tomojiw.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5acf47097---84910626257.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9980d75bd---66345504162.pdf
    • https://tkquiz.com/userfiles/file/dovilunizagibifevaga.pdf
    • https://ludifrance.fr/userfiles/file/pitikuxezixarovibupov.pdf
    • http://vejwun.cz/images/59441517999.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9813b2d54a4106a770b9217cc3749a58/87081689700.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1f1992654c450f107bce202cb4dfdc3c/96101155694.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5298344772d8195f4364de195b9a81b6/82542000310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sound+blaster+control+panel+download
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cb.bin
ecbbd176e0349f074eb149f0d67a10546195c976c37a12e4111b838231e31f51
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 22292 bytes
font_01_sfnt_off000126fb.bin
0d574085bc97d7d2d5fafe4c1a99307745f284eae89ce9cb81f24fe6475f6599
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 5400 bytes
font_02_sfnt_off00013971.bin
29cb0e3629a83ec9e1e79000e278f19fbfa863aaec2613e5a35385665de5eaff
pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 15536 bytes
font_03_sfnt_off00016965.bin
5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16965 16140 bytes