Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a27d6ce7161325…

MALICIOUS

PDF

66.5 KB Created: 2021-09-24 03:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf073d542520d81c8e8cc74afe9f7f80 SHA-1: 1734ab6265591597cea1622c0f44879bfba7cf87 SHA-256: d1a27d6ce716132584c3a78da74a3512e625f36b46272a96bb0cd261c1bcea5b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress upload directories. This suggests a phishing or malware distribution scheme, where the PDF serves as a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8338

Heuristics 6

  • 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
  • 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://naviway.su/upload/files/95174629779.pdf In PDF document text
    • http://uchid.com/uploads/file/loropebawokanukolubezezij.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/tagugesabuzafazazizipu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8d4c7ea34a5e43b13e76905d1f8d374f/dekukulexar.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/putalilibe.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/6749638119.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/4240871132.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/u82l6hd5kedth5vjnns2lk4cbd/fokebexejuloxojaxorore.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/49588164581.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/sugex.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/72124957374.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/42608168550.pdfIn PDF document text
    • http://flomojapan.com/upload/files/97521330323.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b13434ce74---nugezitesifewir.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/nimaxupevezizawexisefem.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/nulukewogizejebepi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/23125427505.pdfIn PDF document text
    • http://healthywithhart.com/res/file/zulubakesiwogikuponazekiz.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/67443186387.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/tewutasojix.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/12499711955.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/33264d857ce81ffb2ce633dde4a3344d/19927401202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mha+season+5+dubPDF 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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 10376 bytes
SHA-256: c196e01a43d2fb23ec53fd8399234d45bb78032d935a9f2e19befc50bff2650c
font_02_sfnt_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 14916 bytes
SHA-256: 7cce4fac0b7cdc4afb6a5b7885bc9d8f1db9a7f73d9ff5823cef379407120aa6

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