Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9321688b996a40…

MALICIOUS

PDF

94.5 KB Created: 2021-07-01 14:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a5fcdcd7a29b1d9b5ad7b57fb9b3ecb5 SHA-1: 603ee6459e7a63ae274966ea8ac4dfdace757b83 SHA-256: 4c9321688b996a40c6d4da5a49841c89c489b6bf61287792103a36f2ff6a82d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6e6fabbf017ecc6f57140d4dc4f5cc1e/teguduwufunedatuvizat.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/404e4918d12cd826e3aec2faed587d35/popafomutobapokodopadarif.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/mibalo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9051aa2a32883b6117de7b206bc9a3a4/javadusoguvo.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/sexorij.pdfIn PDF document text
    • http://ciskmv.com/css/file/puvapipetir.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/14c080f398f7f6184f2cb0377ae19c81/mikamozagibonogomoxow.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mafunazitekano.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/97012881205.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/660e7fba9a257ca35e4a40d21364bb79/mokifinakivujuj.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/befamigebejataw.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f7e90af94---42380737516.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098422031ff7---gubikajuvozepawikobem.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/131e169c69929ea7aebc8917d4c819f3/fawizewevupijuzogojejale.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/q0i6euska706pik8i6hm3ar6i7/7873525539.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/64266450555.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0988b79c---45022479855.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/vukazuvibomijilajot.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/80a5fd04f0d2c6d5d4febee7a409ca19/69640352590.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd4610a9f---nodagipedijateresezowen.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6aed062f5a601dbea77e4e4f9c74bf8e/satilupibuviniloret.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaecb84f4f---rofebetagusotegobegogaxi.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/57210988286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=idle+angels+tier+list+2021PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 17376 bytes
SHA-256: d84e1cb0d530cd0307740ba51c778ae5e46e2d74287c697784acaba4249b8489
font_02_sfnt_off0001537a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537A 10548 bytes
SHA-256: cb899abbe01e6bf013b630fa9ac4784d8cffac7c1a9acdb2b83d558b68fd3bc5

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