Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c738d9b07a929…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 03:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8dca76ee22fff21f64d799c9b91ed138 SHA-1: f1629efe1f763033922652a66575f9709ebbdffd SHA-256: 9a7c738d9b07a929a348a118bbdf76907295bc78e76e776d2671bb8c1af7cbfc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is used for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c339478f---2671998363.pdf In PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/84612540382.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210816075417.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48113e2acf---fefuvefasedobitafo.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/69814563810.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/gewekuma.pdfIn PDF document text
    • https://norservis.cz/files/files/tibekuverexu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/19784786607.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/2678312216.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ju2bsjhfdstfqol7cd9emredj5/funofofatekaxirufixef.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/56481607360.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce48d00969---14492906654.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/gaxirenawafivodob.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/57651756718.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8d3afa52f11195856989115af6c69ae/89120368382.pdfIn PDF document text
    • http://jainfarms.com/uploads/wetivipivilexin.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/83m4utrl7a2mnk2n3mduf8qunp/94769150854.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/loxosamapakogekuja.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e4479c44af3---71663597169.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tatawadalifezuronaxuro.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/aa965248f2d29b20c8e791541a021758/ponupowanujifixuzuwulu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0417675e---tibifibixodagepifidise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=disciplina+en+el+aula+libro+pdfPDF 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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 19824 bytes
SHA-256: eddcbc8694327cb3b7486c9fc830780f691cdf83a188ee187134ddfb713d90c9
font_01_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 10756 bytes
SHA-256: e28836db7783ce9d883dabd93c726f7b7024731f7a39b193805e8640fbdcad44
font_02_sfnt_off00013838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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