Malicious PDF — malware analysis report

Static analysis result for SHA-256 c510bfebd9aab583…

MALICIOUS

PDF

89.0 KB Created: 2021-09-13 20:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 961c5332e935fc67baa0474998e310b7 SHA-1: 622a8436baaa056e23c7e3c93962b7c329195c51 SHA-256: c510bfebd9aab583328513cc10f321758924f40aa8eea884d7effc6693c32bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to numerous other PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://hotnewsmd.deca.md/upload/userfiles/files/65164319541.pdf In PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/jogufodafebi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8128720e85fc8d64411842006b1fcedd/86890701515.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pofevo.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/lekogobukazus.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/39080741863.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109021516144475.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/buganomex.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc4db6f09---89302399789.pdfIn PDF document text
    • https://bselink.com/userfiles/file/javikimuk.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vixuremulakosula.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/ronaxuzisib.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/nemapikinavinanuvizix.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/46979489194.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/62987854185.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/piretefaxuvunidatalise.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/mabavozux.pdfIn PDF document text
    • https://blugarden.eu/file/fuzujeretupupamemesiduv.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/difupopenixofute.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/28626771856.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/sipojodape.pdfIn PDF document text
    • http://cbstav.cz/file/diwewuxatobavufabirukos.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/bikik.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/wivufatezuvekimum.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/bigesifuboxufubabuw.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6f3aa23a---45047007224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=train+sim+pro+mod+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 10332 bytes
SHA-256: 223bae545b7355f3a56c148c1b6f14f52f6466b7eb3d208df82c199212e9a810
font_01_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 22988 bytes
SHA-256: bf1aa2ac7bd6f11fd8c446896f527e2ae5a3a475445d45c8dd2a4b29e98ba80e
font_03_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_04_sfnt_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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