Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c176f1965427e45…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 08:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a1497b7197a16f6b6ec230cb6e8e021b SHA-1: 84ad10c912816324d836011e4f5eab41db86a519 SHA-256: 6c176f1965427e459c14d3ad80a11e9c615b8508a77b6d9bf31f2a80766efb06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript that is likely intended to redirect the user to a malicious site for downloading further payloads or phishing. Multiple heuristics indicate the presence of malicious links and a high ML classifier score further supports this assessment. The ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://eternaseguros.net/files/files/36480174001.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141df730e9da---8123351515.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/27017836296.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/kotozoseberatokatube.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdee8eb04---motudoxaweda.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/45264257669.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/javupezoge.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/11172945259.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/lipekotijitawudimu.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/43285501051.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/81155287850.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cbe3f94b57d69df3b15d5501a97c8d99/fuloxerubewu.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/89822718306.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/13346049229.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614222b23d101---63337750471.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/pomize.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093eb06f9b---73875989419.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/ninuwetobonimowizini.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/nafejexata.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/43133245119.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/nopasuked.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/16593136910.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tirobalokazisa.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/saxebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+outlived+mod+apkPDF 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_off0000c699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 10508 bytes
SHA-256: 90e23a0620e723e90a1109a1b8fb0b928585cf8172f30963ace7b258e4e34693
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 17676 bytes
SHA-256: 6d194ab404c8cf038b753c2310681df017ea3ae4b351a91ac7af06e48a5f6b7c
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1