Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f23771d4d15d1c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 22:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e59724cb24bc24f0d7fd88ca9326227 SHA-1: 586d2300e794866b2f9f502fce46eed3710830a8 SHA-256: e6f23771d4d15d1c63e5c5080d61cb32026b9355de9364faeed83315187c24e5
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to deliver a second-stage payload. The embedded URLs and the nature of the link farm indicate a social engineering tactic to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gursakaryahukuk.com/images/file/15448233628.pdf In PDF document text
    • https://bem-sa.com/img/file/71241337599.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/55171044863.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/i8je5e6l3iu2qjm7ii6u10j825/7547107365.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/56545603273.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddc30c0fd---69202313494.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d538muvv5lu80769keiuvprob2/xoragafuvumaxeliparo.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/77909674178.pdfIn PDF document text
    • http://favourtec.com/attachment/file/71282635017.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/13379784193.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vixejikigazed.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96903342946.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bcsjn4h5jaqqv8b56itslubobi/fogatagage.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fbc87063f33ea42ebb7ab45b2713061/wadofum.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tofagitu.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/kenot.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/tobomibudagamomepomib.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dcsjbp5e41pg753h073ngcls7p/vininivubapatuzap.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1d5cb15c9da931da2139e27b6c1df0be/56588918994.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/zivakasufowojuw.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210809_122504_180.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087afabbdc5d---95077282915.pdfIn PDF document text
    • https://primer-spb.ru/files/files/25907609450.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43mv14u3no06q09914too0the3/78848473448.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/66f5847660bd1fc54ad7d0e2cb8b99c9/guranowewuneraku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=aadhaar+pdf+password+newPDF 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_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 21108 bytes
SHA-256: c7394c5c8f9d776c3213ccc8e860a163134af3a5d7d0e3a0bcd289e016af2b6b
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 10428 bytes
SHA-256: 03d0edd216f8615d4519f30cd3d00d5b248927955fd72b53f470c8c6989d49ed

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