Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfc8e449afd7fb0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 04:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aa16b2e2820a427da7c4d54e9a9aee47 SHA-1: ff28b9747f41810d9bc6280e3d3c3c6287992d96 SHA-256: 0bfc8e449afd7fb0d7bc52818d3558074801452d1e99c27a57b6137fff63bd56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=lulubox+apk+download+free+fire+hack PDF link annotation
    • http://autavrabek.cz/obrazky/file/gupaxa.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/97552091031.pdfIn PDF document text
    • http://taigesw.com/upload/files/nawopadubir.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/kamigovovifijukategamu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7df36f74d0152c2e3f691149eec2e156/41054833451.pdfIn PDF document text
    • https://zzhqhi.com/d/files/66585952565.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b06fcaf---wevagejema.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/kabomu.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/44287094453.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/lezorapo.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fazarerifudit.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/gugifarevawiposisumunen.pdfIn PDF document text
    • https://resicolor.com/upload/files/depevid.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210915151308.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/lipuwegaro.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/24558898553.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/wumitoxolifosikapunow.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/36679101199.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/24998552306.pdfIn PDF document text
    • https://pellevah.com/upload/files/35232205377.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/15603532048.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/delusefa.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1rhlhgddqap7pe3bogaqb40doj/50714249463.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/63830676686.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 10928 bytes
SHA-256: a965c925baf5f54bbcca5bb633229e44f38ee1cf1cacdd4f5735af4ee8e14037
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 16808 bytes
SHA-256: 3762c430476c786a142c21dee5b04bc8a53990b5fa3e9a942edd2422e3d78bf8

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