Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa48f226234ec1a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 20:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 887a9288af9d3282f142866585fe5c6d SHA-1: ef68cd4c312330ec5efd55ce5bc81aec37dfca18 SHA-256: 4aa48f226234ec1ace94f3cf6c4720fdd6b4a5c57cb6c9d3c7a89702aace8be4
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 external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The PDF structure itself is identified as a link farm, further supporting this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=meaning+of+to+swell PDF link annotation
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/538b83ff3a0bb66f85751b8139668622/75955952038.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087711ab74f7---malukudunipoferel.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5kpshbb30lod12ngb8gmmbfq15/6131816121.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/71699201877.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b0178f7a---jototunobo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7444beb141---81663376153.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/vc5jhe4feon489f98kf0s9vqi2/99829194761.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e51ac9342---82133581938.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vamafob.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/viwalilotisu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/j503mebdoa3p6n61a0q32s7sb6/kewij.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/25969479852.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee38965534---75449960942.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/39108410984.pdfIn PDF document text
    • http://abpaluso.com/upload/file/degojimufuvorobox.pdfIn PDF document text
    • http://fitviewer.biz/files/file/83638118278.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02d8a0e09---58501118866.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99151a1e85---12644017277.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/de7d015d7220bda2d6e8179946f7c135/jidugesemesavodi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/734dfbf4d0ef35d4a1fb01ed7896454d/56116688225.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/gexonuzexafufogod.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae25e9ebba8---petanapowi.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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 17704 bytes
SHA-256: 537caebbc442bcef4d8c7dad908a35b3e6f642a3ba5f63afab1f6e093a22b51a
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 10368 bytes
SHA-256: 0f238116199e29f1bdffb707ddc3fc33b73d389acdff5d54aa34c23ffd0c1731
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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