Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee437e8c225a33e8…

MALICIOUS

PDF

82.9 KB Created: 2021-08-17 01:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b71b803ed4952c7fd7c1568931797c73 SHA-1: a1a5b1d3cef45a7983a4925ba08874701d760f80 SHA-256: ee437e8c225a33e8f6c2dee5861896f6c9dfd1f1d2ffba30f4a1d80b6bda06f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to host further malicious payloads or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=personality+adjectives+esl+lesson+plan PDF link annotation
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/64d4d9483e7fed2ea94baf4fbe770e96/muwidizaluvejideku.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c21569d9b---30202750017.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0bf1ea61e61990802d0411082ba3b947/17571751997.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/sfc6m0ss78ce2ijced8hq882oi/53007341054.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/37240138328.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/40789390487.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/94910861018.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xuparamiwelinufezitisufev.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/18555481575.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/72439301799.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/desan.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/5o8ecq86gvaiop8sogmdud1oag/tejalox.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160846bcecaf4d---sarafazivebajemimo.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirewazabamabasebosodefot.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f4548c1386a2f7bb9e4353f8227ec772/23748217059.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/5e456d4e20a4034cfc2c4e96ea0478cf/lefifolazadisadakuro.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6fd9ef18771261e92ef373ccab4ae9bb/fogajubibajew.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/378613903.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/wezokofasovazugudimajedi.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd3f07d69---97136098590.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezopufekonereloguv.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/75028060173.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/dutidevoz.pdfIn PDF document text
    • 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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 16204 bytes
SHA-256: a7077c2095197789ba72f6a9fab11b13c50178945868a0eabfb734e875a4d8a9
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 10820 bytes
SHA-256: 31765ce84ff99488d7420f7287417722a8f7b6e269643cb03798905121b0653e

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