Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2e15469ffce77e…

MALICIOUS

PDF

117.3 KB Created: 2021-07-23 12:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b71ca6a59ac936ef5c5757782b30ae56 SHA-1: a00bc79cbd615f33de0621aea13b98aa51a9f232 SHA-256: 3c2e15469ffce77e48bfd28cb092417533c33d6639f3470aa914b0ff732bc778
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary function is to trick users into revealing sensitive recovery information, such as private keys or backup codes. The presence of numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, suggests a phishing or credential harvesting campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://festival.bg/fckeditorfiles/file/37272245031.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f154e7d014a---tewejodolafimaperop.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lkm9uridkea162h2dvjlsj2i1n/52048440006.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210721064520.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd610d0485b---gesudazitob.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nqb1nm3hsm9jhidq7tu8rgso6a/vojokelolelibida.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aee61553---47885401944.pdfIn PDF document text
    • http://abnicum.ru/files/file/82615718976.pdfIn PDF document text
    • http://ridendo.cz/files/file/bapagil.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c392dc3556---80319424042.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f552e17944937449e353bbaa534ecd48/33404627548.pdfIn PDF document text
    • http://maidichike.com/upload/files/nivituwizazugaku.pdfIn PDF document text
    • http://herve-coiffure.ci/files/lerepodonivudevakepuvot.pdfIn PDF document text
    • https://proia.bg/userfiles/file/werawefumawaxobopemadopox.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb68788635---40696864509.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/d705411863cd1e2c1c7401c740514b23/56288043899.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a137ae2d1fa---sagew.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8235be2a3---safidenosopugupiso.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/32897260502.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/74104229953.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c723c5dac2---23248318732.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/zijajevuwo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b07a27f65---xasutuvinali.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3c0e0219---sopijavava.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/16036415022.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/22006702860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=swap+meaning+in+malayalamPDF 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_off00016a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A43 17132 bytes
SHA-256: 0d46d9c718f0990063ffa8acf707e5244f7446c5622d527355ecccdddba5705b
font_01_sfnt_off00019709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001af20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF20 10384 bytes
SHA-256: 146fcd33afabe78d2b56e4eb467bba4abf4b9e23f2c291587151930005df82ba

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