Malicious PDF — malware analysis report

Static analysis result for SHA-256 389d510d8cabf903…

MALICIOUS

PDF

94.5 KB Created: 2021-10-19 05:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c1567890e873d15bec15dc72114fe2ce SHA-1: 0c5396990a57e3a8e53781aac321d6c14f4cabd3 SHA-256: 389d510d8cabf903825a26ce403b0eda05784f0163a9f22e570353857211d4f9
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress upload directories or disposable hosting. The presence of numerous unknown URLs suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://cheers-gifts.com/userfiles/78297057472.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/r3b5koaquk9m10mnaom2dtllgt/fiwevokipu.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/93201182859.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/pezejapuserirozuni.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/zafog.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/fuvofefiloruzaxodixamuzik.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/dovozelapitivezajut.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/94848923986.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147c5c7bebc2---55281066856.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210926_FCA5B9018DBDAA7C.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/14142227115.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/29649894603.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16169a8de6de04---fidodupetilulokopubomow.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210913_2A3EB3453A05789B.pdfIn PDF document text
    • http://besteva.com/upload/files/74706227416.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=bohemian+rhapsody+bass+tab+songsterrPDF 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_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 11100 bytes
SHA-256: 78e77010e435b78fefc5f5e699e4e0071c3246b784ada0dca987e435f1969fae
font_02_sfnt_off00013a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 19276 bytes
SHA-256: 329876a2647fd0557341ad2fc310c223cfa6626cdd9fec0bb02fe0b0603aca8b

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