Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c47ff5f9751aa7…

MALICIOUS

PDF

77.6 KB Created: 2021-07-30 17:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b670b589ef3325a0e370d15f4c20f7fc SHA-1: a38ae16e39364f07ffa8f0e688c9406a89320a71 SHA-256: 58c47ff5f9751aa754bd3e8ed8afce7360995dd15ab633c2b1e31fdc4499ebfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Multiple heuristics identified the document as a link farm hosted on compromised WordPress sites, pointing to various PDF files. These findings suggest the document is designed to lure users to malicious or phishing content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=describe+how+to+write+the+formulas+for+binary+ionic+compounds PDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/93sd27f3j4vtjrrv7qs3k42i42/dawumulezokamidag.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ada8e1b70bcd9db5dcee617e81edf279/viwipobiragefus.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/12787577777.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/vidogomekipidujorix.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/kodukedezow.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/31967342957.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/menajuwonaruze.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/81257877389.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/5671616317.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/r2kjndkeu3mlkb7re83dd6fjrn/denakiborex.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097250226d82---3406817914.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9037ea7e264ec6807d4c1855b65951b4/dojonusakemusebij.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c956b6cd8e---67888398633.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wovexajilu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bbebc218---bizobezovewuxefa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mazuniluwobikeb.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858e26d783e---julafuwuv.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f073c9902a---muximanigijulafulevexigev.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/mubige.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d7c8134dfabe0808a06821f92c948867/24653595979.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/nonorefuna.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/cec1aff4c31ff1832eda3f5bd54586a7/tegasefabajadovedowuj.pdfIn PDF document text
    • http://learningkey.org/userfiles/dorujifiwadodel.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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 16076 bytes
SHA-256: 4cf7260ef5985c1bbb177e5e67dea68bd373b904a5508b5a0bd99361656204c3
font_02_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 11328 bytes
SHA-256: 24560cf67315eb49dd30119999602262eccd2f7a86d1f36e8fa54a549bd76a33

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