Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bab823878a4cf92…

MALICIOUS

PDF

91.3 KB Created: 2021-09-05 07:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c4d9952bdd10104ce47d37bfe920424 SHA-1: 84338d90c85748fc4a50ed619959040b732969de SHA-256: 4bab823878a4cf92c4dcd5beffa0a74e738ce79f2c8ef88165ab1259fd207b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest it is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 https://pistant.ru/uplcv?utm_term=%D8%AA%D9%86%D8%B2%D9%8A%D9%84+%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D8%AC+pdf+%D9%84%D9%84%D9%83%D9%85%D8%A8%D9%8A%D9%88%D8%AA%D8%B1+%D8%A8%D8%B1%D8%A7%D8%A8%D8%B7+%D9%85%D8%A8%D8%A7%D8%B4%D8%B1+%D8%A8%D8%AD%D8%AC%D9%85+%D8%B5%D8%BA%D9%8A%D8%B1 PDF link annotation
    • http://filippodelvita.com/demo/userfiles/file/99793519088.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/pumibe.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/zavepamulugafas.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079940d3f2d0---womudizasivegojozu.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105232357292877.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b430bd20a6ef6a000a7e01e7d7baa59a/kolabifimebetij.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/109e79f63684a069bdf05db15d168552/xazugirujitarujikid.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/bofososixisuv.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16095b820bd7a8---pidila.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a54dee44c6---38767132790.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16129df101d756---58868924287.pdfIn PDF document text
    • http://frchem.cn/upload/files/pazatato.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0993177f---25033763974.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/55810981879.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc51170b9e---66409438157.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/8abqf0mg9rtshsuqoej0h94nq9/wupirusubosogopavu.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/50898612484.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/slproc1ee02vnh01eaqpfpfpbd/78945378449.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bs29s302rajvl7kfn8t5f2tuo8/pamazegimawuzevozaze.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee19f56a9d1---38981649070.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/duxujimikutalapinup.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/54069074857.pdfIn PDF document text
    • http://apothepharma.com/upload/files/wupobivo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af8c78029---davumiminabidelekopofo.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/gipubugav.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/75005184718.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000fe47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFE47 25944 bytes
SHA-256: 939087c2dcefbc109c46729fe3ff9a7d21f7997997267b278c145370d116a5ce
font_00_sfnt_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 19796 bytes
SHA-256: 0b592a2f62abdef026944a621876eb47e3cb7de030073b3796c96b1df1384f28
font_01_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_03_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 18768 bytes
SHA-256: b29503c3fd4e0e8760babe3207a851a2218d1436e3407bfd97f8d71b4de815ae

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