Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc6f6819181dbc3…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 16:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 455ea3e6a6c6ed08a6e7939a7ee2f233 SHA-1: 6a6d06138e15d16371c51f67283bbb8b2ebfd561 SHA-256: 4cc6f6819181dbc30fd3985c1acaff4d2ac40eb1db2ba98039369a708c859262
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://podlahyadvere.sk/editor_uploads/system/files/30423304174.pdf In PDF document text
    • https://damiel.eu/userfiles/file/vugikaro.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607595d2d6c9c---63578140466.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/bidamafexoze.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/19437853795.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/98265531753.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/cfa52822a533ce3ed865b32bbf1209f3/88705096998.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5b3802f795b5d40a0f7eeb774d84f3e1/27593465020.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/33113983556.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/29874587732.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/58637651072.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/57269853879.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c00c1e179---84379335144.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086be2f274d3---siwutek.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/susowibimimanigadifo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e5dc4fdc---tekovozisolebozogotakizud.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/xepatireburapujitufa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hb90nov6c2kqu9b3ejr6h5b4r7/97176148812.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217534323884.pdfIn PDF document text
    • https://limsurdua.com/contents//files/89446621115.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/gigakufut.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/db518425fce4e50be12b94e445c40f59/43285956420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sample+company+introduction+letter+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_off0000ca91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 10904 bytes
SHA-256: c62732fe10c7e12cbfaafd0484b89ad0b0f6605fd8ae8c7992c6a86d0c870f98
font_02_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 17044 bytes
SHA-256: 6630df5715028e012e46a21a7630342446855ba6602c9541fa09d3e9c6fcac39

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