Malicious PDF — malware analysis report

Static analysis result for SHA-256 1837da29f6d0603e…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 04:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eec3fd855a9b7f673b3adb3ab1e92660 SHA-1: da87ad37a8a1889d7333bfb2e8ee3356a6ac6d8a SHA-256: 1837da29f6d0603e4f3bd186fe397055f1853dde550f84dadb38be91fd0c0ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://catamma.ru/uplcv?utm_term=free+games+android+2.3+5+download PDF link annotation
    • http://banghetretunhien.com/media/ftp/file/vifawapozajoxok.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/1710994098.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161465be23b92f---1032555684.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/watuxunopuwipifaroped.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/76584969932.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/31306406237.pdfIn PDF document text
    • https://europartner2.pl/uploads/10889793092.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/92661216201.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceffb73191---16037778548.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/napegutikalefuv.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210908_356B1B1BA8D6A5F0.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/kukulinumew.pdfIn PDF document text
    • http://annabarons.lv/files/files/74957639875.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/31435758332.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145567459ea9---xomideku.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/99230946818.pdfIn PDF document text
    • https://redac.ch/upload/wafipubikibajojusizixenob.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/59073424299.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/40458648229.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/fokikasopebizadilir.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/panon.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/fuwipogidewasatexened.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/79283353541.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/19612079984.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/somamepafok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23E 11048 bytes
SHA-256: ff669598aeb0d559a72fa7807c66fa5284948cd7d2313d700a705870c8e75b37
font_01_sfnt_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 17072 bytes
SHA-256: 5e76cc9221d5023a94f4e9dcca743974bcae552d6a65a0df9c695fc86315377d
font_02_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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