Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98fe95d776cfa6e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 03:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34927d3ff1f9f69f358d34db8857a994 SHA-1: b78f95345146aba4b289941f132c895e50bc927b SHA-256: d98fe95d776cfa6e1c7794ac2ab45d303e8d97c74a9a6831db1ee0c9b029925f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and numerous external URLs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bluenanum.com/ckupload/files/62916311493.pdf In PDF document text
    • http://orchid-daikanyama.com/userfiles/file/sodukuliwafafobesax.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/98843471846.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20068fc85---memawuxuxebuloruvigawu.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/ganipuvevotonufigukutuz.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/86793873746.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778da25f2c0---61061913668.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/gogilobapefalutumapo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1361b33f---jedarotepajegagonezixefun.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/do1i8u91d7vdkubp8pkdp43mru/43360673846.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///jobumimuwagobifaxowelima.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160afae554bc62---61283713058.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f160184c---wobun.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160899bab60f53---39960729.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d5650c8faad6186dd282ce1690180344/51773385025.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/zujelusinekejikeru.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a681ce24---wolatab.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad8799798c---zubumogugod.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/kigejemitazirodowetoj.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/74881679303.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ede391fcc2f6fae1d905af877b4d3b15/4209570506.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/67288db789cf3f709c05fca8f8f49f21/donizukabof.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/29364854190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=conveyor+belt+width+specification+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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 17512 bytes
SHA-256: ff3507fc928177ffafdf4875253f72db0f308f201c15018a75fe6649c4490f26
font_01_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 11152 bytes
SHA-256: 42d674d8c4b21fc794940633681d3a565dc70538f0ac49f5b76e082cda99ecc3

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