Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fdafd08c41f83d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 23:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6abb9f073547d0f59a0d13c2738ca02 SHA-1: 7dbdd5ffb480718ec53658d32e388db505729f99 SHA-256: f9fdafd08c41f83d5330db664eee46826c63c9f9560cb270f5d84f13ef013be2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://schmitz.cz/res/file/79184143573.pdf In PDF document text
    • http://abacusnancy.com/userfiles/file/92593902599.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/55sv59vph8jimh3lih5m7jb9go/52655419661.pdfIn PDF document text
    • http://slsnn.ru/content/files/jidixukeludi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gewazarevolexazowokanof.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6088d66d---30019578152.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5969bc2ec---15291471107.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd455d31b5---vikarivubidufune.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/74981227686.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/babepememetigukegowope.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/78882791621.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839080b029e---webobumirabomu.pdfIn PDF document text
    • http://aprt1day.ru/file/85036038040.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///72909583198.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///radupejiruzunefa.pdfIn PDF document text
    • http://qwerty.pl/_data/file/7243212626.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/uvb50h79s11hlk1r0p3v369ug3/81191211584.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/84242409231.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/gijunevimexanenejux.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753555454e2---33908526180.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/lipipazupipu.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/58768433646.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b24c50a3---28716589149.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/difaxut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=procurement+officer+job+description+pdfPDF 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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 10944 bytes
SHA-256: 53371b7763fd0e075e2b2a10b7494a7854b3d972aa4b6969f8b17012dc445a8b
font_02_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 16708 bytes
SHA-256: e80438c5e4b1d900238e18b5bdc9887f92b65adfc7b0dee47d02bb91b1eb4939

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