Malicious PDF — malware analysis report

Static analysis result for SHA-256 caad05a163e0b532…

MALICIOUS

PDF

237.7 KB Created: 2021-08-15 05:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1584413f2fb3a388b0df810d5bb6e2cf SHA-1: 4dc9386e7336e9d3e93cbac06351e3e6ab04a269 SHA-256: caad05a163e0b5322b948105ae04fea6d13542ab24be9ffe37d1eb050bdd828d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

Heuristics 5

  • 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.
  • 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://tahitotfaluovodak.hu/ckfinder/userfiles/files/vusukusedumoma.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea83e80f9c---47774906446.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/5465953669.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/9b7d8041ccc0bf017c26857d332f691a/76833188952.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2cce0a83894f5552bf12d1e1a68280dd/papepagowobigimamuwezisav.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d7c6d8bcab1ffce635f0f4968d293579/dutixowapoboluxapiziv.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/32556646098.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4854dc644---75920535198.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/misurolako.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-30/20210730005408565442.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0e561968f---97585913362.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7caa047cb---mefed.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/12706408064.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a741455020d---gobawaf.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2dd04bdaf11ceb15dd9a962f78060375/ruxal.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zamefu.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/36701206624.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/alvdf9n2qcrabca9nafo1rhbv6/55544812486.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16083a33c7a486---bezemegomire.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac678007294---vadidisaf.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/vegudidukut.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/19242375089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=igcse+biology+textbook+answers+edexcelPDF 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_off000342f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x342F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00035b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35B0E 11032 bytes
SHA-256: ca3eff32b0e759eb1c5aefd292a0c642c6c74293c821afa3fc6854e588e4133d
font_02_sfnt_off000374b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x374B7 18608 bytes
SHA-256: b41654e3c5ffc4914906a07d9ee4b38650add0fe5501346dfcaaef745018a719