Malicious PDF — malware analysis report

Static analysis result for SHA-256 1843f44630514076…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 12:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e658241e42003ba2f874226b3959ac8 SHA-1: 5f71388337114a93a64f14d9238b94af267029cf SHA-256: 1843f446305140768dc5b57016e33f1e3ff2d6195d9e1c7bf07de55e41a15908
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

Heuristics 5

  • 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
  • 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.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865f34e885---40967823570.pdf In PDF document text
    • http://buydecor.ru/uploads/files/wukipawel.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hvsfsa4vus8qb3m5fuj05ssg2d/47740997637.pdfIn PDF document text
    • http://dr-temt.ru/images/file/47966229915.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/51286137169.pdfIn PDF document text
    • https://airxps.com/userfiles/files/45174556762.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wanexosuxowapinufodukevi.pdfIn PDF document text
    • http://pedraferro.com/files/files/mekevuwunutiraxoj.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/gesiditilozinediwelonidez.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/zararefazixasapukelurel.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912444b7b9---64553960065.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1aaf84db6---71666973147.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/penorubumimifipirowuw.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/47112311326.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///dizefofadolubawelowigi.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/68140484368.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://pecsimutargygaleria.hu/files/file/mezafojipuwidipixesunega.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141912f94344---loguvurusevakukizusazap.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/17341196694.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/95941496439.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/30438197685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+outpost+subtitlesPDF 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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 20064 bytes
SHA-256: d4f0092658edc016002aa36f0cbfa30f4540a2738c0280482a0550efe3272d6a
font_01_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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