Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6272090e29b0a62…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 03:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a586b8e81198f2b51787223381b529ba SHA-1: 387ba42d27bfd2dcea093438896af715964397a7 SHA-256: f6272090e29b0a62a185028bbaf3434c8efbfa9eddd9084db85956ae282c7efe
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. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=yoga+fascia+anatomy+and+movement+pdf PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/458984c86226aa309af48d5f62b71375/63328674476.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/38390926549.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/83922436081.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/3793071626.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/xujut.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/wajax.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xibanas.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/24143242096.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/39386482882.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gijelazese.pdfIn PDF document text
    • http://hak-al.com/resimler/files/tukopemunexivavopuxife.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/12078318227.pdfIn PDF document text
    • http://cityfate.com/files/files/60159803229.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/40990085040.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/91604831171.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/72284490735.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ff2840ae---buzajusofi.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/85531331781.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/19718788574.pdfIn PDF document text
    • http://unibox.lv/files/text/jepuno.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/90225129237.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/terunudo.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/lezafutisus.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ca56f24ae9e69c6e88c7ae21d1540d60/jesetujajumexizosobujale.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_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 10980 bytes
SHA-256: 49e429e0de220f4f3b2ef598d2f4fa1b196957e85b355c0af69d46a6a67b862c
font_01_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 17796 bytes
SHA-256: 007b4c158307ed0d805702f711a36d48ec937d74b4123c7ac32557a76c5d2442

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