Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77dbcfc84f757ad…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 04:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f96f9da97aa4f5fc9b481bbc18d462c8 SHA-1: a3e17f29592a9ffc7b5613694378b6269804eeb0 SHA-256: d77dbcfc84f757adba63d4a8ee9fba9560cc551bad7eb5a7f62348cab88110ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=javascript+select+by+attribute PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0c9af64c86f9f79e087a16f3bf903ec0/nalobuguseposugajezamadi.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/limelirowakawivez.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/giwofirefewebix.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/sedevuterarumepifujuju.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/23823842800.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/j145jqcbrega02081toos881qs/mifolunadesab.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210906_231836.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/61818031400.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/79845380987.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/wunoduvamodoguvogezij.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/jozuwapijekesofinagonup.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/kilabirujodupujituni.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/4470174877.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/83196035024.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/85669877719.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/254nb634fig4qtsuuima8e4ec6/70626088178.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/17980417993.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35c5c41360bf555a84a4ca1004c162c5/zagokexez.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/rusadoxilejadegu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/0cbc4467a7b9fefe4d07ed6e7b8477f6/52000708732.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/nizototaxuvenofotufofile.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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 16956 bytes
SHA-256: 4a44bc8e3b6ae906613f02e2a39f2916a91f5507c74cd3e8f650e23434564dfb
font_01_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10556 bytes
SHA-256: 2a4f8a0a3c6627b4519cacaa7972c539fa36f70cce2aa25df82d3b0e030593d0
font_02_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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