Malicious PDF — malware analysis report

Static analysis result for SHA-256 4349af97d6dbf71b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-14 04:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55630343b93ed5d66451d8c2feafca65 SHA-1: 50f6ebd90b1088ef821d20a98a28d52fb212665d SHA-256: 4349af97d6dbf71b10ba9a6773ffcdb2dacf43ef8d3545935d797af93ea1395b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for embedding malicious JavaScript or redirecting users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gancza.pl/userfiles/file/ruloguvali.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda2c35d9a---11176677548.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c2fb64c5---12093670603.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/bejewuzodo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a69861fb2---madugojudaxut.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/dubutuxosuvoziwubege.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/5692561667e0397d24ccf0aed04649e0/xabaruradikotodekujo.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/19859687288.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/vvckbq1it9fsmvu20dk316d7db/lemug.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/12370959621.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/43380081032.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-26/20210626010047797664.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a194609636bf0937e939c9cda32e4ae7/jorekegidusuwogiwapubum.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16088e47ab35db---14143446436.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/83525995872.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1472b4330dbdd6bb945e4f7c5b1fd453/10495179795.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/karopoxopikuj.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9ca4c120bc77fc902e6d965599ce5da9/32751437663.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/piguresudopivarudor.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083459e4c4de---69049707139.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3ee998e3abc08bfa53f3e723c715659f/64813550978.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/fabuvipij.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mvmtdeea75poidfvagdjfia312/47936481543.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fc0d52467e618bc02e92172c1004ff2c/xefadasonotosirofi.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/12deeddad21bdcf9d4ae9adaaeee0b2b/75946305854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=application+of+linear+algebra+in+cryptography+pptPDF 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_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 17368 bytes
SHA-256: b6142dba1d53787f7952b61f1583b4d71e872141a7866354f9f8605e44df1df2
font_02_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 10828 bytes
SHA-256: 8cb2419dd055c6e09df2ff6e5213d4cec0803bcf14ed8e6ee662ff84ddb61c73

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