Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1587434c5332c3…

MALICIOUS

PDF

83.5 KB Created: 2021-08-06 04:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae208401f24907784d19366836fe67ba SHA-1: e4ba6f651756f6f37b9d2eab188555417c3de973 SHA-256: fe1587434c5332c36607ca2ed9b33cf5524328b041321d80653204e849bc849f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/minuxu.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b651da48dc61620535b46214f03862a8/zeteluvubutidiwomuruso.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/26308403180.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/64ae0939e068aa2de8ac5aeb12aa278f/9590970216.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/99149964786.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/20a6ad4e8fafdfedcd8a151f32368e39/lonezakitiwibekur.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/tekomafiwixuvajobisujani.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/92525428004.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a50663ed77859e6bd346ef2f8050dbcd/65948700033.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/9238152265.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b6c29f2b---83380346226.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b015e7a0a1---norolisaduzekukuf.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/54073453078.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210710_091102.pdfIn PDF document text
    • https://curvy.tw/upload/files/68715813331.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/abff941d3dd419918f8a3b9248ad1808/38385440582.pdfIn PDF document text
    • https://agatanorek.com/files/file/83198131486.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/lapekujepopadedizisiz.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/nogafekifomudugazivitudi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2d2f4bce6093af8947b354ff94eee1bb/nusugowupik.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/sibiferopovudujosi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4783fb2b---wovobukek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=extremely+loud+and+incredibly+close+streaming+engPDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 11152 bytes
SHA-256: 7751b9e1ef0815fc5483fc556fa4bc61f3ff3a147d5ed61f767143892a2d1776
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 16972 bytes
SHA-256: a3d0f5a13704aa0b1c5555cc0806b9dc09416b2ff1eef9ea161da2573d6afbe0

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