Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c343fa8fc3f3c92…

MALICIOUS

PDF

103.1 KB Created: 2021-06-01 08:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7979c7f4b0e47238820c498dbaf2daa5 SHA-1: 5c4738acff4ca510a1280d07893f786be5c1ba43 SHA-256: 7c343fa8fc3f3c9251822f0d10c115feddc8fb3d4f37f46899b00f216a174a98
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a secondary payload. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the malicious intent of hosting numerous links on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2de187bd316403c98bc0afb200cf3e1b/29988121222.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/fd3b06598400ceda3f4d1fe20d394c6b/12318501876.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41175cc6a---gizuvojaw.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdfcebaa0---pikomekopij.pdf
    • https://facades-et-traditions.com/actualites/file/tubewu.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608facb12fb69---52310917170.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cdc150f206c3109e7a10d6e5a954fd8/44816514532.pdf
    • https://riolospettacoli.it/filesUploads/file/netamemugawurox.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b30gvjch8ikmb21jr0r8s7j25t/batanibijatiwalipewarod.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0e68b40bff725ba0f98f71c6070a8d52/42949726740.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/64843829943.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f6fa7160---lezawudugikebababujob.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/69fr946ks1rv5tal0uj57ccth3/41319034189.pdf
    • http://pressvaluation.net/userfiles/file/gidukabizalumatitawex.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09b38b65e---fugopidemetewujuku.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ckmpkq46h45ok34q1mq3pubm98/deliromojudexebibevivi.pdf
    • http://absolutelyneon.com/userfiles/file/juzifipor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=carlon+wired+chime+dh852e+manual
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001314e.bin
ad7327a9f20dd9173ea6c68443491ff4ebd663eee30c99a3a802edb0f63a96f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 2960 bytes
font_01_sfnt_off00013bd5.bin
30a37eaa9e90d6b6486ac2249e5ec7794ffc683d188f4b7c1b81858e934617df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 5448 bytes
font_02_sfnt_off00014e45.bin
55450db2f8190f0b0cf309a9ddb09af84ac995ff6ec24968a7954a6d9d5ed047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 12956 bytes
font_03_sfnt_off000178e9.bin
00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178E9 16140 bytes

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