Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8a62dac1862f6f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 15:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49637a1921e9ef2d8701167e86577a2a SHA-1: c61bcbaeb168378866584c5bf46490351dbe92c7 SHA-256: dc8a62dac1862f6f4b36527eade6bdf5b7705679f84ca5a7405aec390ed81a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malware, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://abwsalisbury.com/uploads/files/89205790049.pdf In PDF document text
    • http://zuche0551.com/upload/file/gifalimitides.pdfIn PDF document text
    • http://ty-int.com/files/files/nipakadilosimed.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a71a7764af0b0946451d399212bc1a3c/jivazobenapat.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/gexuxojo.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/makiredesiluwenulejiwusas.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109131504134015.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8958eb871---jikedavilopefujarofezafu.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210914_061342_102.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/zogatapevitutizisarituvog.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nowagol.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/27162077889.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/36314262188.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161337a1ec18cb---jutikazeseralewane.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137989826ae0---novuxawejozotexafuwu.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/23036749981.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/netereburevowojazofumi.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090211034048.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfa863e3ffc6f1e824ff66c301a619/goradevofadewuzitizup.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/3756362941.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/65215873579.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091612065873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sniper+arena+downloadPDF 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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 17560 bytes
SHA-256: 7124cfd2c04464f628d0562285de0225941cfb658ad6181af1cc69affdfe1b28
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 10280 bytes
SHA-256: 5bfe8012dfd7e9dced87455b9b7c77ccf2e87a1df710f696e466a0bed02c4c0d
font_02_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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