Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43e929718a2e87a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 10:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 588f320a9174550866bdf65140abd153 SHA-1: fe9e3a38c4f4fdbd3a158ba82cbb53359986d095 SHA-256: e43e929718a2e87a641d9be3a6a832eafb22ad5713f9a78505672ac09dc231d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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://alrukn.co/userfiles/files/rexadifafugamid.pdf In PDF document text
    • http://remont-m.com/userfiles/file/wovazoxobaluligedef.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/divojefudum.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614563735d7a9---xeruwutukuzawasej.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/1391608992.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/misituxip.pdfIn PDF document text
    • http://greenglobepms.com/uploads/42028933938.pdfIn PDF document text
    • http://roocenter.ru/upload/file/vimimegebu.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/32638759209.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/palewonupufumatigelu.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/jowigufatajabulexav.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/55a08c2de38f26465ca821e19ed7f7ad.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mbeedehu3fk16mipq981rp1go6/43622581073.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/84498718731.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/96975862663.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/86753373901.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b7a9ed61---gupijesu.pdfIn PDF document text
    • http://lblussana.it/images/file/7638963057.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/fujuzamez.pdfIn PDF document text
    • http://ttc-investco.com/img/files/48080929659.pdfIn PDF document text
    • http://dogable.de/userfiles/file/61294036369.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/vafavaxisedazudukav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=inshot+pro+free+apkPDF link annotation
    • 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_off0000be93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE93 18860 bytes
SHA-256: 001369f3d4eb109c18bff29ee52b73bc1ef83780e5803c72d188cd01eb88d3c2
font_01_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 10360 bytes
SHA-256: 8bd1c833a6f36cf9887541c16a8876f152f5db297d4ae9dc65e282cfc319b96a
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1