Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2aea211a8ea95b4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 09:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b838b044ad27720dd33052d287189baf SHA-1: 5871430d63e380674b7a08d864c26c1365ff4e77 SHA-256: d2aea211a8ea95b45060641ef2ed0ec73354442d3664fe46b9e853bf32f767c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://wccflooring.com/userfiles/files/30217807196.pdf In PDF document text
    • https://thediamangroup.com/_images/files/64508479602.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/fekipunukafodavaduxe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97838a82f---14196581560.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/gamepolurimigojokila.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/voxibazuxomalow.pdfIn PDF document text
    • http://markone-tools.com/upload/files/joxipobiwinupujetujudit.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084791fb1010---91899608922.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/50dad4b5944f0c864d2719f0833868f5/15770022182.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/benapofivesaji.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4700fd9c8e---tamidufoxuke.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/45081311550.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d61bb42761---zudurolebid.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/21783598219.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/n6o8mootk5mt5hq3haaj6nq4j2/miwariporulis.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe76a720c---kijuwibobaxule.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/69194525606.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e2caa596---gokidikigobuli.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/48878209404.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098970c61c41---36426439576.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/vititorewowo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160aa23e8738c1---rokinanusabusiximujim.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608586df422e0---4601961079.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608019c5b66da---vubisunifanakonaji.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pagadovo.pdfIn PDF document text
    • https://motoralbini.it/files/file/rejazubakuporarate.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/kadikutafobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+charge+of+the+light+brigade+poem+questions+and+answers+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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 17528 bytes
SHA-256: a29aba1b5adb9886bf45f786fc42e8129fae37abd0e91e9198d9f3eb062296e0
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 11500 bytes
SHA-256: 26df9a76c169b96402cd2d1136b8a1bc2b6599742965ad2658948bfa0ec79179
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1