Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b3768d43e2f3a5…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 21:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e997b03747b17d04eac9004bd4b62e42 SHA-1: 810d5ad94cdd7d074321f6dd829bf7cc8f1548ae SHA-256: c8b3768d43e2f3a5c9a49561555308e5a6ecbbecd204ac4962c1acae8d386d4e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS upload locations, and ClamAV detected it as a phishing trojan. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17089c2bc---burawuzapowaxog.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qi292l62e8b4h6p3pf3v4snnu3/64489326708.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d0b62a8d---60656309783.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qbenunnjskcbr1ravh1b5h0pb4/74604366439.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75aef527ea---14955396644.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/josikumosoli.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/o82ig8nbenn6ohemh8evogsba5/96446438293.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/juzamudiniwogapokik.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a5191bb96b4576571f26c578718dba71/karulog.pdfIn PDF document text
    • http://feast.to/upd_file/sexere.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/76318794459.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/no51hgndii2t3irb63jo67ic1g/15928366710.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/dedosukopifanujemal.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cdf20abe---nagogap.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32be7e6663---96613029560.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/1bb69fa63d594beda412deb255f4ed38/69408725249.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0b35deeb8---80187740712.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/24367578263.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/5857729531.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/179f56b0967bc4f29ae3697acb12f761/27005338085.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/4a506182cdd39181295f2da6fb7ae9b9/88593555356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=card+sort+functions+answersPDF 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_off0000c057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC057 17640 bytes
SHA-256: 32df386ba7c2a41ec04a3f2e3354793a94a96298ade117219ecbe2828d8e3048
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 10640 bytes
SHA-256: a9c5998e6bb123e4c5b85fe14a1367fa546c3eac6a278843e8726a3caf06b069

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