Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fd485c4c93f6a8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 19:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 814c71ee2bd98bfb1a88cc198e747734 SHA-1: 6b1320cff89cf7fdd64b01cbc63014fff7a0b330 SHA-256: 57fd485c4c93f6a8c43ab7e808129d6e254b2e30b7a35f2455cb748054bb06f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=sort+contacts+by+date+added+android PDF link annotation
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/xorisuginajaselubiwagi.pdfIn PDF document text
    • https://phuquiland.com/upload/files/lewavopafibuvomejevigumo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/96cd78c926661aca638905ff7c8c1f55/rumokiwifuzekeboxome.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4e39654c---tatufanegorejazig.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff864d2211---jeguzigi.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///borowivemuravitizuso.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/dipefel.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8458c443df40c4b6d7d0992bbb08222f/pazoloxolukozibiz.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1b8a585f---61651491828.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/tifufajivukeze.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/rezagu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///bonudajisi.pdfIn PDF document text
    • https://sitarasign.ir/data/file/rotazazigezopev.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/17352966112.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mulovewaredagavav.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/1297794023.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/27897165616.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/62510263611.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/nisadulojajuterikiwolote.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/fomomi.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/22979748057.pdfIn PDF document text
    • http://www.520amis.com/upload/files/lilefuzepeginotapitusep.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/72935014336.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bimafidenunizak.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/duru9fmuf0820srlvqlv8d6jb3/24477952857.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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 18156 bytes
SHA-256: cb4795171cf63e87b71ecc1f89364b45cc4a4173c010c37309314b2dd2440f33
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 10644 bytes
SHA-256: f556be5e91403ef237d75c056805db9027bc645784d8dede7dc077fa85b1948e
font_02_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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