Malicious PDF — malware analysis report

Static analysis result for SHA-256 412c139b357efde2…

MALICIOUS

PDF

87.0 KB Created: 2021-08-17 15:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbc1899fe17b421954930c595863a641 SHA-1: 071afe01cd2cdd529bdd27b7faf57cecda54028e SHA-256: 412c139b357efde2491bf0b5d9b3fbcbec4cd9ce79e793352365f499fb5cdcc6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting, likely to redirect users to malicious content. The presence of these links suggests an attempt to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://hajnysport.cz/FCK_userfiles/file/90016748794.pdf In PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5de75f4f---28292389434.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a78fc26e919a29d9d715e10e4ffd0281/maluxupugojetemotinizeb.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7dh5ojd83r5r74gpfc5e085a1j/37437878867.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e43535544d3---lotexusifuxusoditumevil.pdfIn PDF document text
    • http://deauville.ru/files/file/zurepozovegurorozapurob.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/jazetosoposusup.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/latevavarebok.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb7ab8c74---soriluxu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01a35361b---76360857403.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8db9e4458---77551637463.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/38842773777.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/99960212578.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/govezofetukox.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/vemon.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/2613949391.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a3060061ef2---tuwaxivirelatoxav.pdfIn PDF document text
    • https://combrooncom.com/contents//files/12014440853.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kiranaxapavetunev.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/rawefamurita.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/zinifojusikumirigo.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/wikumisulanipod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=need+for+speed+underground+3+full+pc+game+downloadPDF 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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 17160 bytes
SHA-256: a95a7501749964aa82774139100dba79f5599602593b577961f7025e606cb838
font_01_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 11108 bytes
SHA-256: 3dc148fea4a89191106a0fa561f39845db44b760ad8194569a1cfdbccf4c2b22
font_02_sfnt_off0001338c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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