Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac9d7be46cd4aa2…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 19:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f44df08d5a02edc3c5e22ed7a683c48c SHA-1: 53922f49850b756f99dfa1fca87749d919be27fd SHA-256: cac9d7be46cd4aa239e89f04a6ad68f222740a0aad4378ea5786857e012e40ba
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites hosting further PDF files. These links likely serve as a lure for phishing or to download additional malware, exploiting users through compromised CMS upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e5174c1e78697b18870a138c167dc648/67237143834.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61026de9a8---wisebinezakikilizavoni.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/13599815535.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/39375920762.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/wexulogigoxuzilovet.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/kamalonowujidodedakano.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088c30bc8b16---jabotebobananusifadaze.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9684db7a9383b8ce9d7f2806075621ec/kamepij.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b219e5db---mekenogago.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/df95539f7aab66a3d750093878ba9d82/90587423264.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bemige.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///76777490799.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wirepomozugiwaderasup.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e493bc5df84---borimoriwi.pdfPDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819adb5bb56---24840234938.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/tepuzovoxumoniripuki.pdfIn PDF document text
    • https://ptogel2.com/contents//files/93215873976.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa6c659e4---21610513684.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///zinusu.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/76405589359.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4k69tb5hfqo8un4qc6hkc1fjvr/xonijidexapodurevupefufe.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161025bd3b2a85---44585345158.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/5634858548.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/99d9ddb3dc4947fcd6f3612857f0f4c4/wibimesofaku.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f099c1b82---budariseladezibezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=candice+owen+and+cardi+bPDF 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_off0000bbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAF 16304 bytes
SHA-256: b777971b2f9544c7c0ce2e5988d63e30aa664012092382fa8c944c71cc468c1e
font_01_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 10308 bytes
SHA-256: e45b9dc10ac174585b0d7922c72ac51377f946caddfe2a093e44c82f6e100afc
font_02_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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