Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5489434e82442b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 10:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 998ff89292b365027c9fc3eeff75e429 SHA-1: 565a9bd5c6b5e35b91c8ba81360f7a14a681e62b SHA-256: 4b5489434e82442b5f0a096ea8c3dc9f2df86114aaffb4c5ecac0170ac0ea5d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=king+louie+jungle PDF link annotation
    • https://dichvuhappyhouse.com/upload/files/19555070718.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/32748012502.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/lozeloset.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/jadofajunebol.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372a0e87184---8842271996.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/pijisafagisomezetug.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/negexufudiwewegokulowilo.pdfIn PDF document text
    • http://metzlerranch.com/userimages/bubonedomobejexojuterave.pdfIn PDF document text
    • https://ikansambel.com/contents/files/vogaburisarolupiraxejanev.pdfIn PDF document text
    • https://rinducm1.com/contents/files/wevukilidapabup.pdfIn PDF document text
    • https://betsin.org/userfiles/files/pazakuxadixiwa.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/nigubax.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/66318285925.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/maripatalebogidimabud.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d30a815db0b7e81491404ff08bff00b9/pexevaxeguripet.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4497c24ec---zojikamupapulewitubigo.pdfIn PDF document text
    • https://grandegroup.net/files/vixagogelipulefajowaminuz.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/xisudato.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/nuxelasita.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/54661035328.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/54711419844.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/65259651861.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/vudubawiwu.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/22715765437.pdfIn PDF document text
    • 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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 9976 bytes
SHA-256: 74bd6e1d40e68959d839e3e49b78067f11fcb6819ff75615ebf550042400a5d0
font_01_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 17660 bytes
SHA-256: fd98591336cf4ea391c8b8ac1458d1a218258a67e43f36f4243989b8d4bc631a
font_02_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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