Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64484ed04d81027…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 10:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9bce536ca1684d82664fbbdc3400ba7 SHA-1: e15751bf4e94b4f380a1f986ace01b47c76b6d88 SHA-256: a64484ed04d8102715b51426fd25b06707d5d7ddbd8e01196d984612212e3527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or redirection mechanism to phishing or malware hosting sites. The PDF structure and embedded links are consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=tasty+receitas+pdf PDF link annotation
    • http://tourister.kr/userfiles/file/45519355764.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9227b1e37b0afebb385c2a2402d844a0/soxelagigizowi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6edd2f9c---9690280086.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/futijesivesupomudodu.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/32928263774.pdfIn PDF document text
    • http://partnercable.hu/files/duleboxepi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d9d8c1fb---banurefebuduvipit.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m08pb9cu83ockepgv7qrqtqj31/bigutox.pdfIn PDF document text
    • https://thepainter.asia/upload/files/fufuwugezodibikofafeg.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a9443bce3cdc775aab50fb986a200984/kelere.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/87864537342.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/29951750745.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/ridojutagabew.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/11547391799.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2s8llkdel30rtakpg81san8vcv/1147175180.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///93921115805.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/26eaa399be42ee20ddf2b5c533e34074/madalujawufeba.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a5bc147fdf78b9e5c253853e23eb6f48/redegibafaxafuvefiz.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/rezogopepiwij.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/71517237339.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16096f3cc334ac---34910220658.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9636b8656---kelaju.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_off0000c1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F3 17872 bytes
SHA-256: 7ae9589aad82bb3ca8c6a70f3ed1658f054c98e54a6acd01050b401e3e16adc4
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10420 bytes
SHA-256: bd95557d5085f14a05f950b8282d86b1a5e622b920ac209828b40d79685aeed1

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