Malicious PDF — malware analysis report

Static analysis result for SHA-256 13184d4561a9248d…

MALICIOUS

PDF

84.0 KB Created: 2021-07-22 14:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a8045cba1dc7bfcf6e04e2bdf8878ca SHA-1: 7bedd4a4504430efcca0862acf41450932ba5f5d SHA-256: 13184d4561a9248d7c74213bb9d40caadf10b0b863bf00fc63a0fdc63cbf7cfa
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609042454eb0b---dekeliligegos.pdf In PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/81392991008.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/28880317077.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/tilesolusowalimox.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/54831092370.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/90214193516.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/dikuza.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/42116638743.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5440365db93b9c8420c73500bd68e061/xigobovogajok.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/00b640b10e8fde47805d3373e06869ab/lekimuvuf.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc78a89940---derifuxirali.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/62504d7361d6960075b06144c0888013/87558670890.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/bd671b8af6576c18600103de40e42022/xinadoximakex.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/varogolefogetigo.pdfIn PDF document text
    • https://drlanda.hu/user/file/badedivozegowu.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/91955484188.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/binuratiwizubo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e9786a76---wusezekoloji.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7c2d8e72---zejemedegikanavekigeribu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/0bkugkdcgrg6lmic8busfdne11/11216342270.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/ruguto.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/jomuragoxodapuxalo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/tupatesefi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3aabdc251---kizalubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=types+of+radiation+therapyPDF link annotation
    • https://medlineplus.gov/radiationtherapy.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 10628 bytes
SHA-256: a7dccbe54f7cefc80ad61d44eac52de9d7e1c3d9f32038ae38c05b8bddaf8a03
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 16340 bytes
SHA-256: 9af3474c607da024ad1037e67f5d23b81cbd045658d381301bb830abadfa7ee7
font_02_sfnt_off00012924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1