Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a0cb97a13e71ac…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 01:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45160823c94f138b13418c6dbce55b91 SHA-1: 603edf94646f50a6cc5093dfe6165837e9b75e10 SHA-256: 92a0cb97a13e71acc10f8bb442d4304f96d7d6952c28a0183358fa04acd68aa1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ClamAV heuristic identifies it as a phishing trojan. The presence of multiple links suggests an attempt to direct users to external, potentially malicious, sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4045

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://inwebjor.ru/uplcv?utm_term=how+to+know+if+someone+looked+at+your+instagram PDF link annotation
    • https://serviceservice.eu/userfiles/file/62727169594.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/42567907037.pdfIn PDF document text
    • http://partnercable.com/files/75660039330.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/jizaradolekosoj.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/68255667612.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/jijimibudifomilumuban.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/60723264487.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/bogisedipatox.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/73371168167.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5003da6ae---lujojarawakixakabonuwak.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/90252737344.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/80300790030.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/guxenepawepital.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/kipiderobetanelininuguv.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/1749326195.pdfIn PDF document text
    • http://newshop.jp/archive/file/jasaxek.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/wozapizumugetu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2d2521ad---dubisutaram.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l9m8c7jp52q7m0i2vgvhphvgrt/93583320351.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jamisavidulelojuvodusuzu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/tasiriwoju.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/71777334594.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44742230405.pdfIn PDF document text
    • http://dsraxys.com/uploads/2830090578.pdfIn PDF document text
    • 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_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 17416 bytes
SHA-256: b8927d612b1126573f7014d24b25002f9ae39f46e3bbccf19c133994af2ef0f2
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 11080 bytes
SHA-256: e701f6866ab3caa61ed0aaff8dd72bc489824af61c055a3d87293e5bb6d4ab9b
font_02_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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