Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc21b2e1116474e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 01:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 575876358c658877c27aeb23a158dc74 SHA-1: 57a880ad132b7f649cc7fe17a363fe132e504bcb SHA-256: 1fc21b2e1116474eb4fd74aca0d3e9fe21c10dc8faca8eb730ca4265ccd9472b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDFs, many hosted on potentially compromised websites or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of external URIs and link farms suggests an attempt to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5192

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/16788369909.pdf In PDF document text
    • http://glampingcaravan.com/userfiles/file/20210908021746.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/zewelosaxo.pdfPDF link annotation
    • http://badgerhillfarm.uk/rofekopofosivo.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/61809322624.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210911_851790EF8C268326.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/kokiguzuladaf.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/77591914071.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/45161783974.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sotujofuvo.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/musovaverawu.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142f955457de---debesoba.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fuwav.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/napadugaraxulelufazexavi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c4c10cadb8f3e597082454eb148737dc/majenujiwekelujo.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/rivoralumevefulupoto.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/bisemuvejizos.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/namize.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af6d7762e---47570289414.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/94020869014.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/botegosuduxebexis.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/25308707188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+block+a+private+number+on+androidPDF link annotation
    • 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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 11052 bytes
SHA-256: c9038d8dbbb6802a205181bb7dad2d8caadc1a74ae506f95845efbdf969cbb03

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