Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b91519f61b3789b…

MALICIOUS

PDF

71.3 KB Created: 2021-07-02 05:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c10f9031d70034f4f2cb0f8993d26302 SHA-1: 061e8842715f0df3723adbc1f3a16b508db1650d SHA-256: 3b91519f61b3789b1c7e4227cba69d4de42e541a0d42103e3c92c0f8dcd0027d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd88a4e934---8783885696.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4057b511---nonufujubifejegapa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/1654746927.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25b81ae45---javosekiminuvas.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da79a2113---90593062185.pdfIn PDF document text
    • http://palami.by/images/file/dodaximaxog.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfe0d68364---66349960426.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fig8k87d9d6bldo2t455mbl44r/kabewikixiwogototepalado.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/086e2cb74c35aadd418d848e8668e3e3/31006126857.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/574e1d50b3b01c41ee33d2f451857aa2/tumel.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/99081323730.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e93c10d53---vavitetesojutimirogiwal.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/81656461823.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f8d41bf6b93f84eb039aa4ce67e7caba/50599896654.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/sowoxudubuvitafazewiwapa.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/33009773263.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/xevovu.pdfIn PDF document text
    • http://954move.com/clients/4890/File/rerajeralikujonojukut.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/2642226712.pdfIn PDF document text
    • http://isvpro.com/custom/files/difilutapikigexawopisaxin.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/i2adh462irpdplpiip2ao18c52/34468103340.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/43971921590.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/doveribubaki.pdfIn PDF document text
    • http://groupkaishan.com/d/files/belumimageg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+report+a+paired+samples+t+testPDF 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_off0000b584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB584 15656 bytes
SHA-256: bf1d4e2ab9393502d5d353e21d424511da00ac8d4346f2c45eafea16280e5548
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 10524 bytes
SHA-256: b34afcecb93ae67882b398219963d3cec7f9ce4c3b77c528a73352a1ce069479
font_02_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1