Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5296c568494402…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 07:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a787292213b65baaab804d1ee36826a6 SHA-1: c4b4bb8b3664f60d37214e7a021e84339e05ad9a SHA-256: fb5296c5684944026bfe429c82163c8618b169592f8bff96aa091d5da9ce7dec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users via a malicious attachment to these redirectors, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=weight+watchers+scales+ww185a+manual PDF link annotation
    • http://studiovalentini.eu/userfiles/files/rosisuvabo.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/mofabobuxule.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gumikebopojapeda.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/rupituguz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcb8960c82---lopukuwova.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/remururogiwawo.pdfIn PDF document text
    • https://khanikango.in/file/sorakesuwejiwe.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/vujelapetevaxafawiza.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc895bd36e---wigunezerigunoligogukuz.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/60003217964.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/48285965507.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/joxulojitagufivaxebegiros.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/jaog1eat03845qg5gfvjdhj826/88491434492.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/nunodonoj.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/dc0n9seein6pvpqio7t4fgee09/39902018431.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/89157424382.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094684e559e7---80274491208.pdfIn PDF document text
    • http://groupkaishan.com/d/files/76513988159.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c60293212b---62807806155.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff35fcc6ab---83063366239.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/51881045687.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/11245500837.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_off0000b671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 15388 bytes
SHA-256: 6726066897c7365d454f1d382977227143d3ff0cf662bca6794c5dbc70c74398
font_01_sfnt_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 11132 bytes
SHA-256: 44e1f65917dc198a7dcb82ac4f68afdbb142d5568977445a7334c8bcbe1b2bd6
font_02_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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