Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d8da769d82c3aa…

MALICIOUS

PDF

73.5 KB Created: 2021-07-04 03:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22f8592c97ee8ec36611227b9edaedec SHA-1: 19ed015e8b09790d9bdc76e846b9240f3603dbff SHA-256: f6d8da769d82c3aa9ffb6a874fe9fab1523351f1c87fc3d0f792ac6713d2d8a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish users. The embedded JavaScript is likely responsible for initiating the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a6689ae5---sulugitolisokekifoviraso.pdf In PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/579fbcf158c55f06f67bce0cd2c14e9b/pavovidewavorezivam.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac5f037e90---dusinemotux.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bac8fa5e386ecf220186492912019beb/nisobumuxipixavutovube.pdfIn PDF document text
    • http://446888.top/userfiles/file/fujoputudabejodagelow.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/393b25383a9b27c04446655e9ecd920f/visasovevesojagiwade.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/xezizigeworoterepin.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f602d9ba0e---winexuzudakimed.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ae5e55e0---jawotidutovulofojuwotubon.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4fefe2ff9---fugeluzavog.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/vekazuvedip.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/vagetosabit.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3045878c5---4355224161.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/97424269016.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/43588695715.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e87c91765---36421766889.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2mhrn0vvr4ebv2j20m7vdi740e/buwaxetubezadumesajimema.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/xororitizimogozobejonit.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7841d5c85e72d45c616f35744e155fd9/mebofafixipox.pdfIn PDF document text
    • http://fields-on-earth.com/webopifaririzodelera.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf43db9e1---ragimanazed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=i+hate+myself+sometimes+quotesPDF 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_off0000bd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6F 10588 bytes
SHA-256: d7d5c0cfcd043de6f01bda165eacfca7ee6c27392b2f12282923c1f48399b831
font_01_sfnt_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 16948 bytes
SHA-256: bd985dad99fe44d0c1d182c276a94577b9e9508ba30f4338e65dfd2a98fbd663
font_02_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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