Malicious PDF — malware analysis report

Static analysis result for SHA-256 671beacc12253292…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 16:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 751fcc4209c9bd656d4c7ac6c5efa847 SHA-1: 0bb5e49a72481c97be730761b17031f9422a87a6 SHA-256: 671beacc12253292393b104ef595fc0141114a8dc72923c0a10314dfe62ccf69
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=b612+apk+mod+download PDF link annotation
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/40633130758.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/57987778656.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/54794644064.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/katazumolalowok.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/dozaxu.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/61693901148.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/darikilekojixapibugi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfeae8894---ziberedebin.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/30524183969.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wobagevejafadivaxo.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/74235508019.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf30d8988---xositimeninixedojafo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/nakutobinamixezejowo.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/15656967584.pdfIn PDF document text
    • https://svltv.in/userfiles/files/73990577732.pdfIn PDF document text
    • http://8njl.com/userfiles/files/bavezoluseziruwuborojog.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/muxebofir.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/18442927120.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/jijiforokilomikoj.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/ropejejifotodanekik.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/75521531184.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b437f127d---57232533154.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/43539822427.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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 20848 bytes
SHA-256: 9ce9743f074470a8d3e5b53512c97d7f2cbaebeade25580967a34e3cef744043
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10532 bytes
SHA-256: c6df6fa58510e61047891c23d69f500aff6084db7bbfcfd3c738520867997eb2
font_02_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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