Malicious PDF — malware analysis report

Static analysis result for SHA-256 876bcb7115c850c1…

MALICIOUS

PDF

89.9 KB Created: 2021-06-28 05:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acd0888953bf5c0053a783977ba06cd2 SHA-1: 87974dbb0edd3ebb7e9de7de8d06ede29f6b4cb7 SHA-256: 876bcb7115c850c11fcdfe3985f9aa7520691fefb39ce8012d92d3410f9c848a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/332efd9745d8e0bf5a2c0e3d6c5157d2/gukinoba.pdf In PDF document text
    • http://china-zzld.com/uploadfile/file///2021060916571674.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/51ad99346383809a2b8ee2cdd4450b38/kovemewebi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc704fd4d9c224fd6d8c671728a60396/newubojamibuwabij.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/sanibixokemejurajef.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/3b094311729f74f10329580d412685c4/wijoxe.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/44999090161.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/tijipodusimibatotosi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf8962f2e8---61893042928.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/dewujutukalodubar.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2s6tskfrffjmthtmm4cg64elq5/muxabonevebipamixe.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/warejijed.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/53758046674.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/f54603a6d05c0e1534f9007e36157e2c/35354282285.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2c3e2d1e6e25e6d3b43aac8abce6eeba/dipunavemiverufenitidinox.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/gibatabulu.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f164afe1d22589ec49aebbba4657dd29/9105790684.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/59329893990.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0s4tpbgg3kfvt8dpakj9fjhfl2/86492397044.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ecdbfdeab94026cc741420b70603a45a/74274500458.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2fb1062cb57bb312420ae46ccebac4dc/78267241836.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/39763884867.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ade2ca795---77143844611.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/aef1ec2fd8c91a3d432d2e9f39adf945/kanesuzodiledewijev.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nkg95etvrsifgrq3up17v4u571/3260799115.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fololinetogosobidosaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=welcome+note+for+parents+from+teacherPDF 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_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 10648 bytes
SHA-256: 6f210e3edbe7154f1bdfca1407262521ee349e6c477ca8458fe19e0268e27de5
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16956 bytes
SHA-256: 5a5c206ccb799606b2e7e8db7023543624301d728270d52db2405aa5c0aed0c8

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