Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58a74974602d1a9…

MALICIOUS

PDF

91.0 KB Created: 2021-08-09 01:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8df41eb3545ef2d4ae351468adfa1c2f SHA-1: d75d4bc9bbdb023cb595eb1a13930013a6934b6a SHA-256: d58a74974602d1a9078b5108a27b8e6bf35914064cc10bf7bc22bd89805111fb
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF structure itself is also noted as potentially compromised, further supporting its role in an attack chain.

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://kythuatviet.vn/uploads/userfiles/file/nowuzezolamigidazemeje.pdf In PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210625_8DCD6656D7649838.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051523572573499.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ea04bc333e00bf6370f731ae7b88368e/poluwibuvulofi.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/jexejemelibijobarerifup.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/12278531594.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921e2db1219---vazozenifoxiwat.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/suwimotikixojikok.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/35775101839.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/aa209d3db7aa50c58069350a1a793ab0/kazig.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967e76e19cd---pilifofuduzowajapowaju.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e5ce1505---36052394249.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625590583.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd9d461916---dorepodaxixur.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7331d9226c---80634521420.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hh9sinv0tbv8df2agvuo231l57/53424226837.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90e50de56---96650346880.pdfIn PDF document text
    • http://saxons99.com/clients/5/5f/5faa49e4155ddd0d4faf97b0d7aa3dde/File/xelelutod.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4f99a269a4411583223b5cda0f33ee65/zuwojevuvupolikilimo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c6711c317b21c8b5a7a4c118f774eaf6/munazujulekomidexaziwosox.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/chmjsd80sfrvcddeubmipbkpvg/rewitokalaromev.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/kowonuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tipos+de+perforaci%C3%B3n+de+pozos+petroleros+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_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10776 bytes
SHA-256: bd2c58d8fe2b4a023a019fc14b01315742c3b0e68a0b69b84c444957ad55794e
font_01_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 18804 bytes
SHA-256: b6f9a0d9fb01b2c088b2eebf1ae2300535b2af680c067f80bcc82ce3d08d00d1
font_02_sfnt_off00014316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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