Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91d5bb4ab206dcc…

MALICIOUS

PDF

84.3 KB Created: 2021-06-09 04:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9a2d29039773e954095964b643252920 SHA-1: 8378939ca4cf688b7ac871c7d149345f36286901 SHA-256: c91d5bb4ab206dcc46f653aac05a8ccc0fcc2c43b9824f504a3fa00ef011de08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/uplcv?utm_term=srihari+ayyappan+songs+mp3+download PDF link annotation
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5na8aogece0javcnrmgdihh90j/15361905255.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6qmlvmgqn7vkv1lbmhc4nek859/kitip.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/38c2dec5412d41cb805186cef76ae21d/ragonopinixoz.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/kr76lukdf4ei51vslmussldu9f/29680365639.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607886edeefd6---39682739.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099103b2f0b8---dedudomo.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kejiwugolekowabekujubiwat.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/39397976343.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4035a85886e47271c3af6cca97a8cd99/fenulifolawutubumokebibov.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/revuloginilimosawom.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cd521bcb---65478480547.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/fabaxowefono.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c81d1f3854---pumipok.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/sc3k3a1jhd2qc02mai02i1ptf2/videlozotevomuribedu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49bb1f842---semumigodafosametosapilud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 5836 bytes
SHA-256: 27b00128d221cc1ea11a31828948420e18897fbecbca1e3ec1e5f66d74bf7ca4
font_01_sfnt_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 11524 bytes
SHA-256: 5529d54da88a807882717a88eb4743a1be0950f91f0cc4d4163b6b474ba8d786
font_02_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 1640 bytes
SHA-256: 63975d493714adb1f25107eb990a1283182f0aa60e4c73a8f150a2674429c6f8
font_03_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 10236 bytes
SHA-256: 35218e69d49a96ace543132da12d94f3e179c120780c28b443b67aa448c5c2fa
font_04_sfnt_off00012ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED6 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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