Malicious PDF — malware analysis report

Static analysis result for SHA-256 365da5095767dfd6…

MALICIOUS

PDF

90.9 KB Created: 2021-09-19 16:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b66012d4ba4708d08cac69c4cc27178 SHA-1: b56010e6db75559bcf4371e7aa5db4ded94412f4 SHA-256: 365da5095767dfd687172f13b5cd90f1d746751e71cdd0c70cfb4e3fad27f7a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be disposable or compromised, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8090

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://medvor.ru/uplcv?utm_term=cube+call+recorder+android+10 PDF link annotation
    • http://chinhsuasolieu.com/media/files/54550813445.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/simavisug.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d860f521a99cce3860323c7139125f9b/90914770727.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/powekakilofuti.pdfIn PDF document text
    • http://dasbluemchen.com/suvigalesinekixawa.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/koxorofebedemuk.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zafozofovomaruxuwib.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6ol7ltptf1noqnctfela8pgeb2/dasiwefozajojetaxud.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/24587253843.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/85206873783.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/52287657511.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb4c2bb0c---rasenapisewe.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/palaf.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/xuvutesafijoteputaj.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wadusudosaxinolasipelalin.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pizodububifowopawuk.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/pigoruma.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mawawosubaxufofusujame.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/duwebejapi.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/39494854079.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/raxamatigad.pdfIn PDF document text
    • http://corkpotters.com/images/26052994918.pdfIn PDF document text
    • https://finliz.lt/i/File/lepix.pdfIn PDF document text
    • http://furniture83.com/upload/files/55204703061.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 17724 bytes
SHA-256: f872f19a49739194f1d250e108d0f7588b10904dd1d0176915cd0ba422e81560
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 10544 bytes
SHA-256: eefc2b66ed7d868add0dc1a950fcd461d0224d540710834034d8d371dcb53d54
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000139a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A8 18864 bytes
SHA-256: 03ee525e7c5ca0135e912449c7605d09dc649beab672add6f204ed2b23e30854