Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ab44e4cae3a620…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 01:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 606d3e1ed9cdd5236d1e3fd334402ee6 SHA-1: 0bd0b8492a9cb80664894b2f7177f970384e00cf SHA-256: c4ab44e4cae3a6200d2b8d797dc2765e96789114f85fb62d0f36cc55d24d29d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=meaning+of+adorable+in+marathi PDF link annotation
    • http://polesprogettazioni.com/userfiles/files/lodebebavuzufe.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3973994e2---kidixeginazaroxixa.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/judatiso.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/64250088196.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/punik.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/90683790935.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/35295501845.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5a4d739a---30615942360.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/pifasemulufod.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610340461e2b5---supokawavipa.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/xonik.pdfIn PDF document text
    • http://bociany.sk/media/file/jigiluwawaturovoxavifam.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608654f1d67cf---fawituvukero.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/makuxopamaremer.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/mezaxosop.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a35b64bbe---dafulikazopo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/339210b432f7e6c6ae83b840eb9cdf92/82958750572.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/tusobevujekiponoka.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/88461555657.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/lulurerikis.pdfIn PDF document text
    • http://vo23.ru/upload/file/jeraka.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e46eeb9aea6651f68748e5b662e2828d/59303619030.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/16473864370.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_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 10764 bytes
SHA-256: a8eca5a050c6b86fca224373db3c886f602dece897cd1216dddceeb869d27dbb
font_01_sfnt_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 19004 bytes
SHA-256: c8ad8ef8fbaed08e4379a86eae1c4273f25fce29f246a33ce832d477e2d3edfa

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