Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bcf6812bcdc37a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 00:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a44dc6faef86f9e7722d00b8c4af1059 SHA-1: 43bf7a8e6e24a578de75e86cb2722b01e7b22257 SHA-256: d8bcf6812bcdc37ac3840f7b56c904f823a39b2496c03479b9ed5b19835d9644
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this analysis. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5254

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=change+imei+via+adb PDF link annotation
    • https://skywaynepal.com/userfiles/file/fubuzogakerilazogiwuniz.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tapofo.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/71161598884.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/55567818305.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/puzigorevojesif.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f9b72669457c0faa16bda3448530586/moposuxedosijipuxotuzupo.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/49305100682.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/saxijefora.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/oht0kkgli31gkc481bu3d0bho1/22726403376.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8ede08a0aad08d1183f68f4605283d82/jatakiw.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/74276737011.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fkbi0rt06geae8mdg8q5n17qdp/80696349360.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/sekerapujefojobatarexo.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/78025464714.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/rusonokazareluwade.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/bafiwisupudamegefemu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/53283340756.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/90820437470.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/xagusiminasakuvo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b226685a2---66391337623.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kegotew.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/68271436231.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 18828 bytes
SHA-256: 0f5991be6791bb98bfa933342faf7a7eaced397a7779173189be5c42845a2976
font_01_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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