Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8197a351dd7381d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 09:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 845b3a6c39c3e5239c0a09b1187f0b0c SHA-1: 507c67488009faee454235476e5a259a08ad2acc SHA-256: a8197a351dd7381df73416e771a9e6313f4f8080dab64ec14a5bc5ff6bf9da4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious site, fitting the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b07587c5d---77677029673.pdf In PDF document text
    • http://mishelik.ru/userfiles/file/70017798204.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xipod.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbe537544---34297794886.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/53141462702.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/lagezujefizunibakujegew.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/mibaw.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fac08e615---vogulezidazamilugov.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/79266181057.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/zenakutujose.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/jujazovetabixirox.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9fdthqvc9vnq14r6dburgsmbt4/sajigetujusedazabar.pdfIn PDF document text
    • https://kildevangen.dk/files/ragatigizetarijones.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/25648685656.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/vazaxutadurojemu.pdfIn PDF document text
    • http://12shio5.com/contents/files/15391597480.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/bekepofegodobofojiju.pdfIn PDF document text
    • http://emannsltd.com/userfiles/83430013594.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/53872523714.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/86592189380.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/bepulivolebewezudazam.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9a16e20d---51400221391.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/fusamilibuwapuzazotaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blue+caterpillar+alice+in+wonderland+namePDF 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_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 10744 bytes
SHA-256: 865fd08a265cea016795e789cd841377fe7ec45dcf4f93fbb167c79ad0c17e65
font_01_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 17516 bytes
SHA-256: de1904ccfa7298fa57e6375781c7761f726731dbfe0a06b577306ffee7e1e097
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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