Malicious PDF — malware analysis report

Static analysis result for SHA-256 6482aee17813d139…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 13:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4f5db7b862f89578cc603aa629a2ef91 SHA-1: 72a49faa6bc7c0f8c48197395bbd48f18f3ede77 SHA-256: 6482aee17813d1395ecba13e371dc7f07880e2f52e3d0791fc2b6c8517cdbecf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised sites, suggesting an attempt to deliver a malicious payload or redirect the user to a phishing site. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with tech support scams or fraudulent billing schemes. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=android+dynamic+theme PDF link annotation
    • http://danieldesignpro.com/userfiles/29005673664.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/aa2040943cfc8f04b06dea7e619992ce/16565130754.pdfIn PDF document text
    • http://oilspecchem.com/files/65609915867.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/65965310020.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/mefubudogilugezidazu.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/85700273752.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/tugabetotozezule.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/56408203834.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fb20a3ba---susumiminivizi.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/nufaxepatofaleriwufixem.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/zigeduke.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/40769886197.pdfIn PDF document text
    • https://eetravel.net/file/tabex.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/85dd9fa10aae308436f6e382ccf8164e/xazoragazijovaguw.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/65307157797.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/11187727894.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/64277832939.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/72636080044.pdfIn PDF document text
    • http://art-ball.net/files/file/7776163439.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/gusuvituz.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/41714105965.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/27139239408.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9c6afb54---59728309430.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/82462526032.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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10516 bytes
SHA-256: 6068cf6f6f7ba1c15deaa6faf8b099c09aa78ccb822f62bd26a71efa20bc1d40
font_02_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 17964 bytes
SHA-256: 6320c1ff046f4a0c1086393507716101a03c69a01068ef802ed8cd6cd19b58fa

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