Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ec5a8e85d3b755…

MALICIOUS

PDF

90.2 KB Created: 2021-08-01 09:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67a8d7a74b003ae8e68256b98eff2514 SHA-1: 874c1be1f8c7433860a21c05fd8a1b999a12f47d SHA-256: b9ec5a8e85d3b755ffcc58033500404e82380725781d2b9bc4eaca7db6398947
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The presence of these links and the detection results indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72069082a---dokuri.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/33249220945.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f85c3c255---12608445570.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/direvuxemenazesot.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/r8h713c1ie2n9drcvc0mkd8i6s/18701656959.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4973af2842---liwiludiv.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d60e85f92---boxefudigadatijigiv.pdf
    • http://bajcsidavidfoto.com/_user/file/97802789197.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f616bd45d0---vavofanulitokifigulu.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6tevnptpuij5vdh18ntj2kutfc/23657548515.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a73f04954---57415108236.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e0fca94da---tugofarilareja.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa37a5ad977---rufovanufuv.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9b3cde27u8lnn77hdbmff3qt8n/19845257428.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3c807ad1889e051fda7bd0d49957e55a/rexolajoreb.pdf
    • http://abimobiliare.pl/pliki/File/44909100533.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b11dd34136535fcb5ee9d84064dd343/59467443114.pdf
    • http://ccspatti.org/userfiles/file/fegolusuxituzaxesef.pdf
    • http://tfh-filter.hu/_user/file/juxufikoxesuguraxetovipeg.pdf
    • http://thucancakoihikari.com/luutru/files/69734013094.pdf
    • http://yesilderecine.com/admin/editor_resim/file/16859588796.pdf
    • http://botosani.ro/img/uploads/file/vejegixufasixedibutezu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=brunner+and+suddarth%27s+textbook+of+medical-surgical+nursing+10th+edition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 16792 bytes
font_01_sfnt_off00010b25.bin
29d84232f12532b8a1f19b922222e0fa68859cc2e12736912a3968e87aeaedc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 11796 bytes
font_02_sfnt_off000126e1.bin
588ff14c6925b0e5ec6cb6cbacd9610839ac46d893727b337f9c24d863795846
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 18764 bytes