Malicious PDF — malware analysis report

Static analysis result for SHA-256 b704b8adbdbe8f2c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 18:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6666f9b2c9931731554e347001b3dee9 SHA-1: 16916edf542b7319f81cae5ae17d6d818c5bd12d SHA-256: b704b8adbdbe8f2ce572ca7ba3b2da3b7eec277b679fb7c25dfd2b8bed873a24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6762

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 http://ural-resyrs.ru/data/file/reminijukelepifunus.pdf In PDF document text
    • http://caerulumpharma.com/upload/files/10467189648.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/darikexidijomuzuvukone.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/27d5546e05b8cfaf6932d31193ef33a0/54752880474.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/37609059316.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/87218145647.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138941301e0b---1712238705.pdfIn PDF document text
    • https://turbooto.vn/upload/files/xibinosekoxa.pdfIn PDF document text
    • http://findacommodity.com/upload/file/30181296243.pdfIn PDF document text
    • http://ed-union05.ru/files/file/wonefosonavagemuxatufos.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92062708264.pdfIn PDF document text
    • http://budropol.de/Upload/file/33997248025.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613794116011e.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=two+composite+numberPDF 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_off0000c708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 17372 bytes
SHA-256: fae868981b12a8a6f78d39f486429e17b4f89b8bb63d499a7dcaadd91e319d08
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 10616 bytes
SHA-256: bb77dccd426e479635c6768d82df5d9a9d687db4a48f4d4400663c96e116f084
font_02_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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