Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25438a7a75e5a24…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 23:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 203c2874c765a3855c7ce358300f7ad6 SHA-1: 3aa1ac5aec8605646d0db771b74b6aa648cadf95 SHA-256: f25438a7a75e5a243c8a774c2d7e68823c7f4442102f0183bdf130050bb99458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous unknown URLs, some hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm characteristics indicates a likely spearphishing attachment or a lure to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kozszemle.hu/uploads/files/65052930516.pdf In PDF document text
    • http://fueandhair.com/userfiles/files/fijumixelugefipuzadozo.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/52696345111.pdfIn PDF document text
    • https://tsolisp.com/files/file/rogifobiseropedujed.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e1de2f9f---ledowutopebi.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9d73a76c18542932499229a2597eebb2/14830947970.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/jesivegib.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0719e812942b5d6b3ca169ede09999c5/95099545812.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/60424429600.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/mivibudosowum.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/42655068403.pdfIn PDF document text
    • http://jarosi.hu/files/file/7622914264.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/sogewepunulinaxakodenul.pdfIn PDF document text
    • http://balone.net/_upload/file///simodi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vuselumunuleriga.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/47f151852f477587df85280c63089c3c/zepevamos.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/59888140828.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610053b91527c---45598542199.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062307455249.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/24882177024.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/97206666426.pdfIn PDF document text
    • http://hotstamping.pl/files/file/44993049087.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/64114682601.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/vosufosiduroxu.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/mudinamamu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef2d5c6cb6---bekabovilupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=conditional+sentences+test+multiple+choice+pdfPDF 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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 18360 bytes
SHA-256: b6e70cd7ac7bdb2b7c41a4a9db929927063641393346143d6dff39dc7cd60310
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 10916 bytes
SHA-256: 5459838cb8d9d83ce174c38be1f5d9cd036b69b9662ffcad8e587b389f33f4c2
font_02_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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