Malicious PDF — malware analysis report

Static analysis result for SHA-256 df94b7f64af829e0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 12:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e8bdc8e8bfc4771cf92d23f2b897311 SHA-1: eb6cc1168b816a86950ebdac55d560149029f9ee SHA-256: df94b7f64af829e099b085d1940610402d728273f2189bdd117da30beaa753d1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc326b54bd---83290225519.pdf In PDF document text
    • http://hocomesun.com/upload/loxajuxozatarele.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/96703870532.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/80682247779.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/foworixiwis.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/maxoxagegemaf.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/wolofijebubasuwumatub.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a21c84be5---wuxow.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/fuwatujidikexef.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9n40l51ot07jap3o0vjjsgq7tj/68604665714.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/pejujipewebexixikupas.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/87465513650.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/54866104552.pdfIn PDF document text
    • http://orderkai.com/uploads/files/70134531603.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/5325086494.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/56498892152.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/44085187203.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/nozuzuloduwiwogijotabowap.pdfIn PDF document text
    • http://4bx.pl/public/file/vesunokaw.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/bajuru.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/76312688008.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/wawujirudulodumululeli.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/zitugewilunasetizi.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/ditagewu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/poxipowoburil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=desinstaller+xooloo+androidPDF 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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 10344 bytes
SHA-256: 71f45fd32ccc81ccf7aade8b304d7b6467077d18b7aae98fd562278de33766d5
font_01_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 18236 bytes
SHA-256: fa7eae887e6de47790ba7fe19eb1de3e535cd8532ee2f8e08ab85c1c336c32c2
font_02_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1