Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a6caa7240387d8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 21:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55de445402e05a747ed9941a0e1fc49b SHA-1: 61303614985d9dee23109503ced45d3a0d2fd028 SHA-256: b4a6caa7240387d86c71fa8514008f385a6a776fb4bbda4a5258fbe4c813b5b1
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. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics (compromised CMS upload link farm, SEO disposable link farm) strongly suggest this PDF is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5c3c51c9---72164609654.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1508abd3---kogasodukus.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/p8sl197vs65aj1uq7if47m1v2p/wakabuno.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b278fde4071---rimowabigida.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/36338693298.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b48e5b1a3---zisijesumejul.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabed662eb---70327884749.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1e3b1fcd4d2570cac67b122d23b0e0de.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e016ee28954666cfc9d29d8d9fa0a393/devevo.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dc11965f87c601a678f089907f50719f/90071228974.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/27009848568.pdfIn PDF document text
    • http://sbairs.com/datas/files/43855530787.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/lofup.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f4eebbd8---datowigodesefon.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/ludatawa.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/47866513892.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/sigexowuxufuburudajepop.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/binizefedafed.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/rubegubuwewopilibadidaza.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/808559ib1ijnpfqa64oj62sl4e/fujiwap.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479995bd41---85631473643.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/gibepowexup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=flowserve+mechanical+seal+catalogue+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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 20480 bytes
SHA-256: 026568bf2bc1429fa43d7a0065ce0b0c8b2f80371ab04a731fd19e4c0946869e
font_01_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 11296 bytes
SHA-256: e983b9fe1272c27afaaa9989ceb64a3f449a9a929b2a384f122a4b5d49ba3c9b
font_02_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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