Malicious PDF — malware analysis report

Static analysis result for SHA-256 1037c134a36a424b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 20:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b1ae7323558009bb75b7961e0a9a606 SHA-1: b6820b762531b35283dfe7c16b5bdf60c983a990 SHA-256: 1037c134a36a424b12cac6eefacaca9f1c148b4c6d6cf402261411a3ccfc3fb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to external websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=directional+terms+worksheet+answers PDF link annotation
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/61130611218.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5bfb7411---nunoruwileto.pdfIn PDF document text
    • http://termocity.by/pics/files/jixekuj.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/081954085004.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/lakifugunejosexexi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2bc7b5d55---posebadapatete.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/39890418727.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hp7pkgkmrc61npr1k0u13p28nh/54133646424.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/400156924.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417377a6ed---nasivukivusezezonori.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/37125236152.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791714cb387---zimikowodafomenoziriv.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/metexujigobikaboranofuja.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2b7beb4c7b176970bec5d3d2b1578a3b/30563965852.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdoi9u0dcdjttr4g2q7d62t57h/kinimidixe.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wakonomakeredafovaf.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/tapumoveven.pdfIn PDF document text
    • https://activepymes.com/pub/file/41063080546.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/65435167585.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/43538591979.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ede47af3---supijukoporokimaxe.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_off0000c41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16456 bytes
SHA-256: 0791af44d6e2cd75ce594b183de82c9670a6bc8f7f53cebe5cafbd4ffdcca40f
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 10672 bytes
SHA-256: ec601302c4b4e2affec03c07ac3065c79f7b06452ebb7fecefdfdeda19f71b1c