Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b26b757167e1a9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 15:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 649a5c5883d28c1ecbd2e11dbdc964c7 SHA-1: 184c4faaf3377e44e126e14901c20aa7c8898ba7 SHA-256: 56b26b757167e1a936068ef82672224103a7c14b689794ebeb7bd9d42f52667a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm patterns strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e558a9d865a---85006740240.pdf In PDF document text
    • https://havadisname.com/upload/ckfinder/files/nubexozaputikidamis.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/17339192351.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/f3cc0c9848a1f53230c22dc85deba956/zixerapefopugumowe.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pajemomod.pdfIn PDF document text
    • http://healthywithhart.com/res/file/gotike.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/kubatujonasosotusakana.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160725bf6e4fc6---vurutowinalaxigelozo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/996e386912903db88d56614337909b2e/xibovanolilogugafevetef.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/72540976274.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0191040c5---62573732590.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/25287675737.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/49751591275.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3c54b5e41e5f35ee00f20478c16c6621/demulotubunufa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fugiwuropanufaremor.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/19456798432.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/30968664905.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/60754792303.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/42a44567e4ca87997571fe7bf8127f05/72155902793.pdfIn PDF document text
    • http://sartor.ru/upload/files/99830610349.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/xomuzebi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/pbvacfqj2kbuqprhfq9q0eutk3/makemidaxakusaxugogir.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/56141214575.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082398943223---paganikepuvalaguva.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096609d36811---movusig.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b3321a05a2a6341fdff1cd587726cc23/96956485315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=expert+systems+principles+and+programming+solution+manual+pdfPDF 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_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 17576 bytes
SHA-256: b86fac09f6c7d092cd4a38a0a536a1af38ebb70a7c99cbed9bff53c357a41816
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 11260 bytes
SHA-256: 752c36cbcedc00481a69360f0baa3754c8e03ac14f1a3113746d298b93a6b30b