Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0247baa645581a…

MALICIOUS

PDF

94.0 KB Created: 2021-09-18 05:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 691e93d327881409e2aedafcec108771 SHA-1: 47454be3d16fc79e46e8f9cb59554ab1e3430a4a SHA-256: 7b0247baa645581a9b7c8ed82047cae384079fcb2ace805e85db354e7007aa78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links, some pointing to potentially compromised WordPress sites. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa1a07eb6---77289501495.pdf In PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e7b7848bdcc19dd2bbbe63f3a8dcd6fa/fawepif.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/50893223032.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/58145897223.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/hrefqrl0v5sdi0e7gnk8ntrqoh/61702802504.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fatibin.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/63310316134.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/ledavuwexerinisonujiv.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325d24c929b---gulofevikeg.pdfIn PDF document text
    • https://ms01bet.net/contents/files/luworu.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/xovunos.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/panabufalurag.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/59992990552.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fageg.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/52058873393.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/lomaxoxutapubigiken.pdfIn PDF document text
    • https://projetovm.com/uploads/files/tasatupezujolef.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/87160563569.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/50086810994.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/74217285232.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/28823922751.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd1b6d36---kubafadupo.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/mozodifirole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=java+code+in+flutterPDF 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_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 19512 bytes
SHA-256: aa1abfe7070ee9047e517ef3fe92f605fffd6018020820204269250ec50c9437
font_01_sfnt_off00013a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7D 10460 bytes
SHA-256: 800f5aa2464d0eb8a01bdda47a91c68434cbabce642ef97328eae481b6a656be
font_02_sfnt_off0001525f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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