Malicious PDF — malware analysis report

Static analysis result for SHA-256 9377155c5a1ab8fd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-26 07:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ce295f3b522a225209e9776a6ee6aaf7 SHA-1: 2c04b73810a4fcb074bf59915cd065bcad5cfb86 SHA-256: 9377155c5a1ab8fd7a50ce42365253a680c1d16963c9014c83e86e2661c56183
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://gabortech.com/admin/file/4459434452.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c8c56506ee2da43db8b1c6bd2b1cb0d3/sifubazav.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dffa02bd3b---98416788183.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/xevigunikenat.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140d70df2a13---jesemenumudifobaxalu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/xizekekamojozized.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f23922d832---xasab.pdfIn PDF document text
    • http://flexa.cz/docs/file/6154804621.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mowatusasivujiw.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mowazezuwepomogeniga.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614561bbbd1c7---tuginevimegaxidanid.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/tamemikodalipil.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6b6bead5---rekapuxurajajadarepaledu.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/gexesigadijamifip.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/19726522464.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/zekojoxo.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/42622167067.pdfIn PDF document text
    • http://uhorder.com/upload/files/vonexujuporokafawezil.pdfIn PDF document text
    • https://agermag.ro/mm/file/29729784109.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tezuganojifoje.pdfIn PDF document text
    • http://getvisa.ru/images/File/jukitubatilakovid.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/70636676427.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/mejerovakobuwijudusake.pdfIn PDF document text
    • http://poiskvod.ru/images/file/27245836406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+apk+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000119f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119F9 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000b6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BC 21256 bytes
SHA-256: 297e296c9e8681ff17dac7cc8dd6c1de954de3e0e97811739ea166b7f113c1ef
font_01_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 10140 bytes
SHA-256: 8400d446cc3f435d682bc668f120e44cfacb528db2d6578bea0b84d8a77f3c96

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