Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e799ade3e443c45…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 19:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 487e01541f2167fb019b9e68b9321b7a SHA-1: deaf7442d03e376b6d4ad4a4789591e667ef9367 SHA-256: 8e799ade3e443c45f8bdaa9744ef3d45e765232a6ce87023edf74d022d014e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate an intent to redirect users to potentially harmful websites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=i+am+sam+online PDF link annotation
    • http://taiwan-tsai.com/upload/files/85698440783.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/28930995202.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/85080577596.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-09/e02085d68d59569679298d11173bb59c.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/nalimu.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/jafal.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/8670987425.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/efed35d24ef2a83c8b703f6a35267a6c/wawepalupisufasusutiwis.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/21058285933.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/15977762915.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/71488058367.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/39095090342.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/72078414797.pdfIn PDF document text
    • http://df-foundry.net/d/files/55624783764.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/sazuribitobisefawabuf.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ph8sgg8vmtrsvef810dqrf97ss/nadadimopo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6d2c2d4b6---40650338469.pdfIn PDF document text
    • https://matratva.in/userfiles/file/wudovuxosazojid.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/60095924209.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e864a13823880ba1d8c2271163ac3bc1/vizetowokofowisarewozisa.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4b0d266494d80a164938aee863b00b03/67727315276.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c3a14f6e---4671078810.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146eea63c309---99882905847.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/dadilujip.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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 15780 bytes
SHA-256: 8132f802ac2b9d51b2bed93e16b18d6a5866b31788e0846199d3583d5735d7f0
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 10020 bytes
SHA-256: 77f8ab53e5a66ff577fcc9b8b3042031871f1318fcff38a201cd0d1dcfe403fa
font_02_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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