Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53f22f19138d612…

MALICIOUS

PDF

86.7 KB Created: 2021-07-22 10:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: fe270b21f54eaab3676a9b658d426162 SHA-1: 2cb57f069e14731680f584b3e018e4e594f66aa4 SHA-256: d53f22f19138d6126e1f5535d56242ce881b1838948864dcfc8766841b10fd28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://contabil-fiscal.ro/mm/file/19228990373.pdf In PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/403708d03d013df2fec9ee0f21461f16/xigowazonare.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/xixarore.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/xuliselafudamogixoxoma.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/15075275582.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/12928377347.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/16807692664.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15b51ff3f---60374432646.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160771c1d9add6---13572608424.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/nemozetimu.pdfIn PDF document text
    • http://ezibra.pl/upload//file/xadomapibexowuwegal.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9cc110e7bc74eefe5b09f66f7ef465e7/97323050491.pdfIn PDF document text
    • https://semut73.com/contents//files/40284604303.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/xixag.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cd71ed2a2---vutepelusugasedulup.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/i49jfa0apsf815f671th79jga7/44049132733.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/98950691129.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/najetemitebod.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wifitekivin.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e72f1d6024e0d213a396cf30d3506449/293685727.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/11563495125.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/4579004557.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/dutajizumi.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/vofaturiwukigot.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c209bc8d70a---15422546923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=superficial+blood+clot+in+footPDF 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_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 15148 bytes
SHA-256: b108fb82cb8a2c9a2b551ea3408ffa3b66dba8e8841afb2d91e41258aeb010a1
font_01_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 10760 bytes
SHA-256: b081696517a8ae962d25360d625f5df3927d930cc165077d927dbff2366d017d
font_02_sfnt_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1