Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9fa88a96a5197a…

MALICIOUS

PDF

88.4 KB Created: 2021-08-16 20:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac54e95c1441d12d816851df2233f141 SHA-1: 22040510eb0cc17b78b2b999fe3842538266863d SHA-256: 5f9fa88a96a5197aef5722d9802b56f7dd17057a35441dc832c7e517f22e394a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or malware downloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://akonis.ch/userfiles/files/gatepuwajofurarexar.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1ab72016608fca8fa32d1f518b8f2fdd/surejuposokan.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bda5c9cfba---82712554039.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/37942772226.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/70592618463.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o14o0p50jpmsn0ng2bto0mv5cc/dopugojozebidenumovase.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/27114831451.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7d8fecda9cdca095371cce49f29b33a3/19255788443.pdfIn PDF document text
    • https://bataretak.com/img/files/file/domunanesisitube.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxebebuwivutaxoje.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/dijasexewupifaja.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901e2270cdc---dajilosotulodaji.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/masududiwomuliganutamaw.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3447ae13---gakisepu.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/jebeb.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1253159479c66f1a10f6818a92d73b96/66084851246.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/39574888856.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17703e977e---91864205575.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160912273d90eb---79059879566.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/19185622718.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/3b8fa8aea8cf0ca826953c97c0a3bc1b/fedajurudusojujodofukeri.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/noburanumopasapi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160826f3d1abe5---nepirawesodemitobijizix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+lose+weight+on+phentermine+and+topamaxPDF link annotation
    • 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_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 11016 bytes
SHA-256: 0da331c70b9667a4819064b91cff12cda65ed6123fc73ef45fbfc8275dd90b44
font_02_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 17588 bytes
SHA-256: 37efe5556138db940e6fed83b536fc967c03e929cb153b84b8f5f03b8021e28b

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