Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d7e6b0b0b3720b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 08:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf5369ee01452d328aa4ec2987221777 SHA-1: fc72a1a6f2849e982d59024196f5587758395c7c SHA-256: 83d7e6b0b0b3720b11820955bd662855b61cce46098249a2c8eb70b8c2c36f23
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/kutuma.pdf In PDF document text
    • https://tese.in/ckfinder/userfiles/files/23042405908.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/21687966509.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210910155332259325dte54.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tideranibazevafuxumewoj.pdfIn PDF document text
    • https://csodamalom.hu/files/files/sonin.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jelavusaj.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/bomaw.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/lasuzajoxorovudube.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/46974079456.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16147d80235d29---25964050511.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/98486916367.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/93300332297.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0d49e8a4---40108726795.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092107172873499.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/lelaziweruzinitebi.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/41801240728.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/50333351422.pdfIn PDF document text
    • http://195exim.com/datas/files/91096077763.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/dukujaseza.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109231842244248.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/51196986977.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/5255596330.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df67b350f1---16456511040.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/sovufesetedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=apk+hack+asphalt+8PDF 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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 18788 bytes
SHA-256: 73696c57defcc4bdedc1523c58ad3e5fc7a8781a964ae2d1a0aef97cc64700d9
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 10204 bytes
SHA-256: 77c64ec828d744573cae44cd4086434f41746eb7d1e2ae5ca7425badb6b64e20

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