Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ae36b2d3e5484e…

MALICIOUS

PDF

90.4 KB Created: 2021-09-19 21:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7d9b98fd7aef8174a4606cf4200942f SHA-1: 2ef7c78cc753fa543759962db4d7ed31c129dac6 SHA-256: 18ae36b2d3e5484e2f4b5c8dd08061a66cdbcbbfdebd9b8154dd894eb42df89a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=brooklyn+nine+nine+season+8+online+free PDF link annotation
    • https://delta-relay.be/userfiles/file/28131489265.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16140068146ad7---vunodalopifokegalu.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/degipuxunuzo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613895f94aead---42924900546.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/62408184199.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0a4bdf38e362bab44e3fdd457a6e98c5/jexanizularakerubosovif.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d26f2957---30304262979.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/86289393872.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/podivodejogibazi.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/20849389464.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/31241401172.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/78585272848.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead09dc94b---wunogodotolejozozenabiz.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8527a938287f1a578920c92212034707/bagirujiguvinumawesowutap.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/sogizujuk.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/buxetutuvibigakonufawat.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ce2d03b4---migakozaxuwexawonafiw.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/lonumor.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/72471050625.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/takumuxubazuxexotirus.pdfIn PDF document text
    • http://space-edge.com/upload/files/46686758068.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/c9b525daacfd14f03883a8bc4a929f2a/vekabakopegumipixomomib.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_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 19564 bytes
SHA-256: 11b1b66a260a3585dab13a1d92edd7490bbaadb54b108cba87ee15995bdc9b9f
font_01_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10576 bytes
SHA-256: 6bc7e57a486bac001b576295a49742045bfdccc56f0411978b48467fee367c66
font_02_sfnt_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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