Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e279d2d47d21553…

MALICIOUS

PDF

110.9 KB Created: 2021-08-01 22:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e081f0956428d42b58a05635732f67c SHA-1: 78ee55012a33ea3039d1ac8cfeb784ebe0d5f5e7 SHA-256: 1e279d2d47d21553263122034b8d135b824b6066179bf2e7c07200e55228a27e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of a link farm on disposable hosting and compromised CMS upload storage is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078314624882---nesuzorazoxe.pdf In PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/032c9ff7ee7c66306355539461ab4b31/65816242946.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/dovoxureforo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a0682a40550d321682b1fa05513973e5/zagaviwesepigutiduvope.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c9d242a60ebe0fbf346500d977ac5481/xosudotipab.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ccnrvugvp8r35ef5sasbtvjkb5/65561258055.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdacb2bfd4---paneju.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/722de20ca07af61e275e0f6baefca67c/xifebofisubatazexo.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/noniwexufuxegaxu.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/suwedaboriwawanidoluribe.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae00deb56c---20431854768.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090988367e4a---fokejiralamorakujobax.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075855402b55---satoru.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ohasbmk1ijeotj86mq7kmlo274/51298126483.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/73835420041.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5c7979a0d---11289903737.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pkgta2fv00ivu6nkuleqtdrp9p/pufoximi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vssai304cfbe7uvi4rc1v5bvqm/fusoxojetadowadeja.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e05a58e1---wopakosenexu.pdfIn PDF document text
    • http://wernitznigg.at/files/9745346030.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/wugaxetenij.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/33a18ita19gjjc7upi33s366en/54086542996.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6f17b0d84629347df13e3fb5f26981a5/xopisuzevomu.pdfIn PDF document text
    • http://normel.org/files/upload/file/gekujonidudabepuz.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/2273546905.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/87511254232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+does+the+rose+represent+in+a+rose+for+emilyPDF 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_off00014bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBE 10872 bytes
SHA-256: 57d5cb33cd98e44919a851bc9ee0f399705adc74f47fad980c78e43417600fec
font_01_sfnt_off000164a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A7 17736 bytes
SHA-256: edcc2a786e9b194bccf28990776572428eed7c42f3f4447da6922ceb90f5be67
font_02_sfnt_off00019302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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