Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa66085b6bdb26…

MALICIOUS

PDF

88.2 KB Created: 2021-07-06 11:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0fd3e2011767d5d5c9a272dcc39fdbd6 SHA-1: 43588d35a183158644b91f32ca494e1a9e898d68 SHA-256: 83fa66085b6bdb264c6e711da504650219e58b50f5100b46c2a85e939c45062e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The embedded URLs and the nature of the heuristics strongly indicate a spearphishing attachment attack pattern, likely leading to user execution of malicious content via a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=aed+to+us+dollar PDF link annotation
    • https://dcoderesearch.com/uploads/sifodadutenokepef.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9d9db91682e3b67ef4f37da875fdc774/bitebomidebutal.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1e3ec3874a1b1517ea0cae32b625cec1/ladamikififusagigiwebef.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/mozalipedaxibimujawudivuz.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/bapaxugetagewakowi.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2ba2baf2ac485f765e3ed59fa64148b3/nejogopasi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/539e74da21bd4599966f06dcf978fe14/xavewinaderi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef45999b31---80305815733.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/77551931061.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vovunoxog.pdfIn PDF document text
    • http://faradbox.pl/files/file/wipomojofimuzazujategiwap.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/57172097827.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8927dd71cb---werevurederepal.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210619_C320F711F0C930C9.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c37ca6bb---zarininepitumefifexaja.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c647c0f39f0f6cd3a5933c05b7902baf/jomimukibere.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d00399e52---tefadosujuvekow.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/luvuvof.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/61403728460b6174e83f57.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844808bbfe9---kodizofixefoxududi.pdfIn PDF document text
    • http://mp-journal.com/media/file/bumotofarikudemazigoroji.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/62100562523.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210603_DA5727F851EDA079.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_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 10128 bytes
SHA-256: 766099c0a35d1abc18e3e6bd269169cab36fd3d810311e28ea507060b26453f4
font_01_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 17184 bytes
SHA-256: d3038cbd30c79136f6f133d8075d30e70a52344770cbb64b3dc7dec5228c051c
font_02_sfnt_off00013a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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