Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9a8328a63fefee…

MALICIOUS

PDF

72.8 KB Created: 2021-06-26 22:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d218c2d0aa4595ef4713c2288a457374 SHA-1: df2b02c61e5ca3528fc2c2e823642e1f996826ca SHA-256: ee9a8328a63fefee2d18dea9d294081b3f49a8f60e779358388ffd1bd2e8da9f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS uploads. The primary goal appears to be redirecting users to potentially malicious content or for SEO manipulation, rather than direct exploitation within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/42804964014.pdf
    • http://qiangka.com/ckfinder/userfiles/files/43692062188.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fd2d2f1d9b8539ffe576c2107f638cf9/48013230452.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160980a002c122---fevopiwarebanofakaro.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a055ea7cbc---kirupi.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/81942684486.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b60ac20feee515c914d5e65e75cd0b77/pozototexowidogegomid.pdf
    • http://braciszewska-klimek.pl/fck_files/file/7395162288.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/29605096624.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6687455cdf---mogexijonuzegorevibe.pdf
    • https://mvpartners.be/images/uploadedimages/file/rariruvanesoka.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b8c00326d6a3bd5961372f7e8c465ef1/bokotagijenawarutemosisop.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070ede588dfd---gidisab.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/pulusizatonadoxowam.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/7978719251dd00b4a06d624564f6ab15/89173058290.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc30edb5b8---kuzitosunipasivelebi.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/wabamoladerojibew.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/e8vcdgsrmlhpi0b6hl7638jhnu/xowegedigaligu.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609013c94918b---zoguzesoxumaretubu.pdf
    • http://candientuvibra.com/images/file/bozuwasakewaxesepazusaku.pdf
    • https://calmoinc.com/upload/editor/file/gimapabukuvojerosoxetagop.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd6e8f5f8---zosibaxubagekebip.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c84609a0b---57273525861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=blood+loss+after+c+section
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 16792 bytes
font_01_sfnt_off0000d2ac.bin
b4056de6cea052c2cdc817493c893f5e2c4a5db24231797ac5d2e6b26a84deab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 10520 bytes
font_02_sfnt_off0000eabf.bin
c09004fb87e4315e42007ee03b7e1a99e66486ace379d58e186a5a861f1648cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 16176 bytes