Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c43bae303b45e22…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 10:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5af323be1453c606795d6d372f87d36b SHA-1: b5620a4df41e3a767a21e25aef371cc2af7219e6 SHA-256: 4c43bae303b45e2278352c3d46275a975f803b26e8a112f26e236e7289c28682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://arichaindia.com/userfiles/file/biritazan.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335db19e594---bimukimibut.pdfIn PDF document text
    • https://emprenderem.cl/files/29665820778.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gulutod.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/11091094208.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xenupo.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/62362690104.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4b2f72671fb51a943b8f32746631efd6/xobifikefitisewined.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210731_C6F735F7E9E84AE1.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bddf62e7a75---23999510026.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1b4e27bcb71fc5e98f73ce8a84ce0a0e/55986735907.pdfIn PDF document text
    • https://xistenze.com/files/files/75482727972.pdfIn PDF document text
    • https://12shio4.com/contents//files/wotobigupusifuwima.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cd66fad4ba91f620e27e3d05a66831ef/4607764387.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/18bcb7aa32a69ee5f22f1e80229da140/11628949175.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/zikuruzevijabowuladita.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/nijojedodap.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6ff8d14a---26072695187.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161246d84ed30a---jabugaxodafavapikujotik.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210901012415.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/64064358425.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708258a74e4---xazozujaxotagaka.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tituvenujan.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/dugetekano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=two+way+anova+with+replication+pdfPDF 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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10776 bytes
SHA-256: 84876c49d5e14d3bd8aad11987be10a51a90299e4f55caa183a998ee14b757af
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 17284 bytes
SHA-256: 591b0c82a5ec15c5183a74b3b01393329398b98dee70511e196a9773a9c63933

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