Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eae23d08d60e64…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 10:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 989cbd157bf6f2381d5bd38b44ec2d1e SHA-1: 53ecd8d0765b51053d9d3d2349f8ae975b922079 SHA-256: 78eae23d08d60e643337d024650ad1ca41dfd6436fb462d2c53059abbe36d074
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate malformed streams and a link farm pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs further supports a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ketchas.ru/uplcv?utm_term=probability+of+simple+events+worksheet+answer+key PDF link annotation
    • https://adrfarysz.pl/userfiles/file/lafitamifobatiwitodek.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/fupebosaxijoxobozuwu.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/63330004143.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/89300522628.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/pofolu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d096d1223---16575091238.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131099a5e36c---70300126426.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/1533395808.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/nalaja.pdfIn PDF document text
    • http://systematix.pl/userfiles/file/kapun.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7bd2a0fc---91359390147.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/94413832670.pdfIn PDF document text
    • http://espicycooking.com/files/file///fifetafidalaxagerowigu.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vixepozop.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/66065988386.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/xiguluvu.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/nuwiwokaragokom.pdfIn PDF document text
    • https://jetaime-shop.com/files/65236517112.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/wivojaxovij.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/boruzafigakuzapika.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/37613038816.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/remimog.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/18557429754.pdfIn PDF document text
    • https://majubesar.net/contents/files/139389919.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_off0000b777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB777 11120 bytes
SHA-256: f4cc86321961066b86be9be94be1aa828d3d8ae6d718e1904943db7deab3d935
font_01_sfnt_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16512 bytes
SHA-256: ba6a3f4c3a37dc48120120d91b709e0443205957f6991fbc92f30e32e74231f3
font_02_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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