Malicious PDF — malware analysis report

Static analysis result for SHA-256 1833ea00d5d7794a…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 14:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cd5cce8114e39a6b721661aaa4ab616 SHA-1: 16d4d304b5fcf88eb976c4d71cecfaf048fb8079 SHA-256: 1833ea00d5d7794a23713d21bbc5317eff62b6b99b4be85d870b228940719c7a
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, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2ee9ad19---nolezesudife.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vo89tfdf6ior5ctk8vssrr2lfu/21557870422.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558f2a3339---gowijezubolifikum.pdf
    • http://visit-pune.com/userfiles/file/vozapuf.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accefeb2510---pizifa.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085de81d44c1---71523858766.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/mneck10lv0pn8jt943k26hj231/nixebew.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/60jnnfnua1crl05ioau86atb1g/7368029450.pdf
    • https://solo-enoant.com/content/files/files/nemuripiparufefegunetoz.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210622164207.pdf
    • http://fatamorgana.fr/uploads/assets/file/vimuzefidiken.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160860356b309b---vobijovuveremuwibebog.pdf
    • http://apsons.eu/files/file/84787643931.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3704a64c4bbb0f8cdf7b53c1d6e35035/mobekemasudemubuguw.pdf
    • http://tano-cable.com/d/files/zetinarexawafawu.pdf
    • http://tecsun-moscow.ru/docs/file/98072060512.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/192d8c2155fdd4061ea8b6d57ff58658/67596768174.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6cca13ba---fabejaxokexekomujinajil.pdf
    • https://zlatartopalovic.rs//files/goloranitikalovibugokomed.pdf
    • http://www.bufolari.com/public/immagini/file/90962787853.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b04032dd5---niravi.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086173b117f5---wukurofokig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=shehnai+music+for+marriage+mp3+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://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_off0000eb0b.bin
cb76676e44204a2232cd12f930d6c2f2c40d363da28f3755806dfd64569bea1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 17676 bytes
font_01_sfnt_off00011985.bin
3135bd3dee8d3eeeaa43400d0972e5a632cce047f271560b197d85bc6cd14a85
pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 11400 bytes
font_02_sfnt_off00013405.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 16792 bytes