Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03c267a1b47e49a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 14:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5497e54918427a1ddd32e36ab77ff8fa SHA-1: 247a3091b0e76c545d72beefc52d238c0588b8c3 SHA-256: d03c267a1b47e49a711ac7e3b40969cb7bced962e5f13bbc949b78b721041604
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ozdesignhouse.com/app/webroot/uploads/files/53682096783.pdf In PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/mawinijakimumajupepu.pdfIn PDF document text
    • http://wdnederland.nl/file/fifuziberufojivunok.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/4834844643.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/52848946935.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/seduxepomibatidefifivoze.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/dukusexewa.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/sejasimukufis.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/16051134351.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/99698309994.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703909b1790---72418185569.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/pgprphicb8i4iie6so0drbo34q/sekasipejamojumixeramepu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e45020e2cf83157399ada08b730c95b1/xebifepositilol.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021081818364441.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/gudemulixojuv.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/63422453549.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09071a057---petevenejetada.pdfIn PDF document text
    • http://armanetti.com/images/71996637453.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/54608851532.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/90517395017.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a72be1a356e78d4368b6adfaf9cd0fe5/sijigudow.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/623268b975698916cb22733e65c64b92/mibagabamakupil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=example+of+feasibility+report+in+technical+writing+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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 15880 bytes
SHA-256: af402e8066ae25d1f195505543266006217f8ce25537ac7cce8901a49c303dda
font_02_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 11492 bytes
SHA-256: 4eb8f543bac6d232cb88e116927189f4e4e84840443b781b0e0ac1a3195911a2

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