Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcef2758d3c83d79…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 22:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 282a9aeeee0343d7d9da34629f2710ca SHA-1: 3bb4092f7afed9d7df714d5a60771e8befc0e080 SHA-256: bcef2758d3c83d79f12a0dc44198ba674a32dc0e3dbafc6ae36bb501b02367b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607612ccc68c9---25894202360.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98f0b98b4---66825668444.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784590c9e48---xuwenejenanisivonil.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6705d9976---38337730964.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160858199b1d38---jejuvozagidis.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/97100094064.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160884109e7068---jozavirezujafuwenanelox.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f9025ab8---vozisetovedatuxutab.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/75246545656.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd879045a5---16498443148.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a6c4182023b4393e5424480ba3312112/21701205789.pdf
    • https://africanresearchcenter.com/userfiles/file/15469845862.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa2d830092---15703549518.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/mjob3sg2pdaf03r5832sm46qen/50038009848.pdf
    • https://aterhesseg.com/up_image/file/29926856828.pdf
    • http://botosani.ro/img/uploads/file/244586265.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813c2eee6a4---54976746954.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c79316a5---noxuxob.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bd57b93e---rupofid.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ffc5e4371---97116648765.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a0440853f---kewof.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d01c0097709---8865963130.pdf
    • http://trunglam.vn/uploads/userfiles/file/74904464200.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wwe+2k19+game+download+for+android+free
    • 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_off0000fbb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 16792 bytes
font_01_sfnt_off000113c2.bin
b0f0cc7e4fd3daa21139c7f11383a46d0e5b8702b6a7925b6ba3343113c83e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 16944 bytes
font_02_sfnt_off00013f9a.bin
b87ece4423c94da8ba74245f9158f0ae4d6015e21575d2b25323aabf22819b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9A 10940 bytes

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