Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe8573a801f7995…

MALICIOUS

PDF

106.8 KB Created: 2021-09-14 21:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 198df0f32b2915a6d5e020128023e366 SHA-1: de6b1ac663efeae65e391aca7093262aac140697 SHA-256: 3fe8573a801f7995ac0b7d9abbda97b831fc8d950122152f346c48e459c0d26d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a link farm pointing to multiple compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://a-guskov.ru/uploads/files/lanabigo.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fecd72b24---susinegabevabivo.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xafuli.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/sojukozo.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/vovuzasesipememaxifused.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210914090449.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6d717rv2hfk1qbp4fbipf7aegq/58697521056.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/1528919228.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/lorofokuvez.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210911202339.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/33551420995.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133114f09a44---41381838075.pdfIn PDF document text
    • https://network-italia.it/file/11159708303.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/74680907396.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/40545848647.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/didixiliwabegire.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/filiviluwapuwopij.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/43135297041.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/21886718686.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/54305981942.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/wikamaxit.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/95647992350.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/fiwunaxafirukiruxabe.pdfIn PDF document text
    • http://erdbau-rauch.at/buwakeruk.pdfIn PDF document text
    • http://cityfate.com/files/files/11353051065.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/dipexowasixisagosugepumeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=my+personal+blogPDF 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_off00013c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C59 18912 bytes
SHA-256: fdfd8e23eb17c5bdeb7a0563d86666efdee662e05ec615aa964f85e7e1897d32
font_01_sfnt_off00016d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9B 10484 bytes
SHA-256: 3212d965fae8abd11c9a21f3c4ac1346fcbc2cf3c44d7db109b5dd337111d6a2
font_02_sfnt_off0001855b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1855B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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