Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52acf21af03638d…

MALICIOUS

PDF

94.8 KB Created: 2021-06-08 21:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b11a112b9300d4a907b8f7bf702d8d6f SHA-1: cbcb5c8cd1a8dc04743893db0135867a67a11bdb SHA-256: c52acf21af03638daca9370fdd04be186bc34317fe4e62054ed2526fa1593182
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=paneer+wale+momos
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed72e2b443---rixof.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0c19b61e2cbb0412d30245702e06fe8b/51224855189.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4cbd023df---83323860774.pdf
    • http://assistance.uz/images/shared/file/wovipularefitodebi.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/21974639373.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deab52743a---xaribujelumipagisu.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/23c4930ca75fce7cb607de955d814793/kunilivilidotitide.pdf
    • http://www.deopendeur.org/imgUser/file/zevufupulawizewe.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2596d2a09a2c38b2c0d1d6345afd3334/daxonokuwixew.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f0643abac5482111aefe6b51b40e0cf6/75616358008.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b5e1c1a9---56447440422.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3900f1dcb---bugisodixuk.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb8d55389---siburedo.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/41b430d8ab7035c0196d252f57868085/92636918310.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/dofel.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a2f46f5174bff325a1ac8da817d5d34a/metotupivagejisixiweti.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/42755131590.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://fedorahosted.org/lohit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e468.bin
69af8e147acd4ce2e7a00d68a854e0936fd434da26172ca330cef86f12173931		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 3056 bytes
font_01_sfnt_off0000ef5f.bin
f38e20913edde4a7b37dacf67ecdf52c709a73aa48841dc1d93464f2a29871fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 4924 bytes
font_02_sfnt_off0001000c.bin
4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 6148 bytes
font_03_sfnt_off00010fed.bin
feebfbeed476829014e3a73c44d26e1ac75240da9749352b352bc18b931184d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 11548 bytes
font_04_sfnt_off000136cb.bin
2344cc1cddf9e1b9d08b66018325d21219f000bc53d49a4f4ce26a8dbc96822e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CB 16816 bytes
font_05_sfnt_off00014eb0.bin
8419b0404363157e0b42a5a2b542a371bcfcee0ee2c72f81433e51fd8e573d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB0 9540 bytes

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