Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c262e4ef20dc35…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 02:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ed3cf969ea24b42c9decbdfd009423c SHA-1: e3bcbaa45648e5501df0799203b74331115f343c SHA-256: b0c262e4ef20dc35918452cd135f0000ae4366cb1cd2a3d512e354f0c7bfdde8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=aplicacion+para+instalar+aplicaciones+android+en+pc PDF link annotation
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/j8vqf23auoi1smbsd2p5rapa7e/42970064786.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/rudexelijamow.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/82065738840.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c5c4eb73---46128793399.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56114793667.pdfIn PDF document text
    • http://abwrva.com/uploads/files/nifosokemiwotuburolesuroj.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091123142220.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/2448448073.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/53431866365.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/zizaduv.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/8452248912.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zobiseviw.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/vumukuta.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/mesaja.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161401fa36ffa2---12952619886.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3b70835caaea43a4fe06288f3c605db9/xuwunumixo.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/nudafedelowuloge.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/31972100298.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6aaab8389---75875494910.pdfIn PDF document text
    • http://client.diffuse.info/files/20213545183.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa52336ee4---xabatupeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e5857250---54086733732.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/vokatunoxavikowe.pdfIn PDF document text
    • 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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 18516 bytes
SHA-256: 011999e0a9756f82edbab3bfa9eaffcc6e61e3614500624fef3ad080953acae0
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 10488 bytes
SHA-256: 9e993a89b301ba2d78228a71d45659abc7a0fcaea6bca90c2c4bd052e966503c

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