Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bf7ded29b193ac…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 11:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 621a2757a382a640ef2b6f58900af5d2 SHA-1: 33b29ccadb7bacb5a7d480fffeb0fd4e8d190c25 SHA-256: e9bf7ded29b193acc16249f9c819ed9be17e2b8f7fa4763d4516e1112e98884c
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score confirm the malicious nature of these links. While no scripts were extracted, the primary attack pattern involves luring users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://sjar-tech.com/uploadfile/file///2021091419032173.pdf In PDF document text
    • http://15441707.com/data/board/file/20210913030802.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/zevudefutali.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/uedsm52r73nlvjg76s5d70blnq/vupevekevo.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/1032286160.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/natugixu.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/29484751665.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/jovoposagomovixu.pdfIn PDF document text
    • http://castel.lu/userfiles/files/34838754621.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/65862012773.pdfIn PDF document text
    • http://jinyezi.cn/upload/51405059940.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/74079757533.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kofomibukokus.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/gukebazoref.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/42710340885.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pijogonizidagimovokikogu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/webuxoxipabumel.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/34866581648.pdfIn PDF document text
    • http://dytac.hk/userfiles/52316704846.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/01dsj0tdqijjmck6h8961j7hk6/fazasibu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614547be27ade---rigozevexiro.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0230202a094475b390f5cd95a939675e/51370284960.pdfIn PDF document text
    • https://seger.cz/userfiles/file/64153721675.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/dexejufojo.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/ramabobagejotej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=telechargement+google+play+androidPDF 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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16016 bytes
SHA-256: 8afd880d71d992dcc35903ec0e29ab6dd31759cbb1e05bbbb676367b58f4d5fc
font_01_sfnt_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 10872 bytes
SHA-256: 46ebd7d54a51b1cef5652c8c784d8a8955851bac203a8ed80db15e4da5789be9