Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd22ef165d5a8100…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 16:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adff3b4ee1773468946d079da39ada29 SHA-1: cb4100c442050037de6a0c35c9765a6521b969ad SHA-256: dd22ef165d5a81001a7cdcf21838c7dc38cfdd0d507e69f4520991d09370e7b5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or distributing further malicious content. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3653

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
  • 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 http://perila-vrn.ru/userfiles/file/86206695194.pdf In PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/ludew.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/27692779159.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5majb1kq9kuga0krvn5khr5dql/matiwixi.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/14338829911.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/90025817524.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea14c71fce---4163123730.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/luwakugiwi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/86qeb4gmbpjeog866r72hu0e75/nejejegopusajipeti.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/66182a79748fa6578bac41cf2cee311d/gemobidazibubuz.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/14384737932.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/xogiveta.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/68774006955.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/namokofikapixizinud.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b3b564181c231abe3c01f400a9cebf7b/36158356898.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/69aad32402ccc1fd903bdbd17890213a/29185505737.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/jewagizovisavinibejemuxad.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/toxedolenidoketikan.pdfIn PDF document text
    • http://pvvc.cz/files/87367908213.pdfIn PDF document text
    • http://metzlerranch.com/userimages/38874457608.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/17216884638.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/64803123134.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/40254880560.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/vekifetakenazedutafin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+long+does+cooked+chicken+breast+last+in+the+fridgePDF link annotation
    • 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_off0000c3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CC 11064 bytes
SHA-256: 11c634c100770c769a8f8ec47b217d1c352b2dd4df17b7c790c5bb86b1048b5d
font_01_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 16816 bytes
SHA-256: 1bfd52f00c70166b0240e403a2e858349c8271d24d751c672b5834d40b961cc9