Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff95d5386a60260…

MALICIOUS

PDF

103.3 KB Created: 2021-10-05 12:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82c9da3ffc4a0690d14c7601fe5772ad SHA-1: f5840d0f4d5b1a0e1cdd26b1610e498f3ede505f SHA-256: eff95d5386a60260ee249220f4d7e0cdd706ccffada243176a5ba10436b13078
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://archism.ru/uplcv?utm_term=fast+and+furious+wiz+khalifa+song PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/afe5a5c6ee05cd89ed25ef020b9e40fb/47598800729.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/ponesasiwalajuf.pdfIn PDF document text
    • https://airbays.com/userfiles/file/baganuweradi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/seraridevobet.pdfIn PDF document text
    • http://jucal.es/images/file/68346955081.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/42797874440.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/19712661942.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/gegax.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/kelevatilez.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/jetalobi.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/78892954063.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/763d3f5590afca80098fd1f76f991e5e/32225873347.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/97657271180.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/72418899569.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/berow.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109271826096119.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/xutebufuxoxabutudavibukuv.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/pomux.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a94a8d57e31f1b8115752679765f5f8a/79262219324.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/jeleve.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_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 10816 bytes
SHA-256: fa1f5ad7ac91913e7c017fe213145acc227e62551b48e92b43ead3de48ae353d
font_02_sfnt_off0001593b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593B 21032 bytes
SHA-256: e923292abd24b1057ec680c13695ae5a9be860ffc8d64699a35f55d5b38c44ce