Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ca1bc1f1a985bd…

MALICIOUS

PDF

94.0 KB Created: 2021-07-03 07:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42fa3e0631c6a253779cd8c8accd5feb SHA-1: 33cc19c7db6f20990148d87bb6db3b5e6da28a03 SHA-256: f3ca1bc1f1a985bdb2f6845b9d05b0c7209dead16a227b84784f85d68120e3dd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress installations, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b678c340e37---54576749017.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081f9f714fa4---27748770473.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e089526a4d2cdd63d4e0c7184b055960/271544531.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3624ae52---85628299195.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502165820650.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/76553273076.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f4a9ea69---widakulew.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/95912006775.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/69670102751.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pdndp3k9cdlu6kr1va03ieipcs/43300644821.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/13c053a9c003dd342348a4f0f4f62131/30317431104.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/pegan.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/faxekedekudewatumaxenax.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xodobusexitixelibefib.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fec4718ea617dfd95ffe60b35a104526/64409476625.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9244d4d923---46871934040.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a743b5427d7.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/kewelisefinaletesog.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/70db836b31300868873c0ffce17e0d28/wajubaro.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/30918568510.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3gp7ltaukg0cb939r1it8bqtld/gubibeme.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160878d1a2fb73---37516065008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+christmas+coloring+pages+for+preschoolersPDF 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_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 10904 bytes
SHA-256: 5a0d89f539a5ebf5583aaf74c6790d832381611b70cf1aa2e4e7134eecdfac48
font_02_sfnt_off00013eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EED 16872 bytes
SHA-256: e994056f6750fe8c817d5fe10511588904f175532e5c6ae9cbbe04eb0d2a0e9b

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