Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac58e53dc6ea7de…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 03:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 97b6ca1d6fa5491a99828ad2a3d77c1c SHA-1: 5f50f7ce17859c3b5c3cb3acd79079b1e27e759e SHA-256: 3ac58e53dc6ea7de76c07c6714ea128dd9da7248c4914a1ba562001f30309b4e
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 links to compromised websites, including those hosted on WordPress upload directories, suggesting a phishing or malware distribution lure. The PDF structure itself is identified as a link farm, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=freeze+baked+chicken PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075c63704b8d---39434124233.pdfIn PDF document text
    • http://korytnica.net/data/files/70594608244.pdfIn PDF document text
    • http://moneymaker-gold.de/files/sipukote.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/4565036101.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/xoxezosamosekowijakemida.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7766dd2e0---bavakosonon.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/5469916407.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/mazupuja.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/59805236804.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/darulijekevasosob.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda85245e0---86143418892.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/jikix.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/14345189530.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210812_66253215C554180A.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jitosodiliwurikuzetexo.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021072809131670554.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/54b997ea69810fbeb8f7a0c882b99df6/surifapepe.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ae267ca8---jalovaziga.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3b8f03f694f7f26b767a6b5a6a27fa3e/26893433875.pdfIn PDF document text
    • http://darec.sk/files/files/81124431989.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9hsc67nkdmghjvl3mh39ktcjfi/viwef.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ca7625c9994bac9ab839e69fbabe68a2/14355139144.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/rowam.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_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 17660 bytes
SHA-256: 2d9e69bf7387ec3cf56bdbcbae1c2ed31973d5788e8b60333c2c6a25a9462f2e
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10304 bytes
SHA-256: 2696ba41b998a3df514a6bd4113626bca0b22688ed3c3499a38a5be40ea5b6bd
font_02_sfnt_off000136b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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