Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adb3d734861ba8d…

MALICIOUS

PDF

149.6 KB Created: 2021-08-01 20:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c97c50d8779274f24811e49fe8d64cd SHA-1: b77e5f9eec52f30613e8327936a19897520a7f97 SHA-256: 6adb3d734861ba8dec7673403a1c98e5d7e129301995b3a6f9c8564be098cdd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4238cd6f1194205d1908f05989e9c26a/56966391761.pdf In PDF document text
    • http://jinanxintiandi.com/userfiles/files/51332958406.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/kilekujojo.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/24062042905.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fef11ff1a3b8dbba45c2c2948166bbc7/50266630437.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/xiluwofa.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c23c5f497---matof.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sma2rdd5lijpl69aqtq2ovg2tn/leder.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608eebf876570---2280979514.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/medepijem.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/8146079810.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/govixudurebil.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf182840f---26619422602.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e3a835e57c1013264246169b09628083/65036607678.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b93832f8---xalalow.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/tasikakotadorezo.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/57336924708.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160de71706dbab---xonebiw.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/tegavavikolilunoni.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ae146e72---vukilidifu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/51067755283.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608323812f5fb---9644519681.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/beliladuvinipuwege.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/mevepadonavutadupazeget.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/26482196081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ancient+ayurvedic+books+in+hindi+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_off0001df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF8F 22104 bytes
SHA-256: 439e22b4ee5c615bf366e3e14649db1310b2b7c835067e91fb9b13d2627ff807
font_01_sfnt_off000215ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E05 11164 bytes
SHA-256: 8098258c8204959d7bbda40748d098f50d13b30c08447ff5ea9f3e5f5923e8b8