Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3e23b0395b330e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 10:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c56a2e48c98a102d48b75243b4ac00e SHA-1: c30a7635a12177f5ad91a3e2b3736eaf77392e20 SHA-256: bf3e23b0395b330e94ec33ac3273e1f5ac6dfb05e8ed761cf9ace55daee9c9a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms the use of compromised sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/efbd1b11b1aebeeaa4f9bfbdb6c191ee/lomedofanorunabifo.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5d6984eb2ff3b58ed4254a34e34a2522/jojapixakaxixuxedemos.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/90683790935.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/pirideguraxolegajid.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/29487072842.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6eb8fcf3---luwupinalaninekoreg.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e035vo9v85a8k6t3aefanj03to/45417450179.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16084b02d4d587---fuxamil.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/jagovarulufuruxe.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/taled.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/64842694796.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nthffr4k07v7g5fhpvp1igkpeg/12819698519.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/72922301411.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/6585012357.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/kebimikemakijedaritapuk.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/reguwozofotunerijowe.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2af02lqj1df66g8fk50kujci3l/naniregefupagef.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b42fc65d0---kipukilotozopetowiloriv.pdfIn PDF document text
    • https://hse.tw/upload/file/38843003546.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/28783813427.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107300222042780.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/92866578.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/sutelidiwimo.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/gufesadexugokisojob.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebfea5402b---44030454031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+biology+book+for+neet+pdfPDF link annotation
    • 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 18496 bytes
SHA-256: e54abea0502e80ecf9b2ae30fe387038fb9a0ab48bf55045a1903442410a7112
font_02_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 10912 bytes
SHA-256: 5a8d37f9fb3e37f10ab70df2aa201404a56f6edb196fe5d38da25f816d62897b

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