Malicious PDF — malware analysis report

Static analysis result for SHA-256 db741ecb40bb8638…

MALICIOUS

PDF

88.3 KB Created: 2021-08-18 02:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8de579ee2eaa5870b077a70bd8a6077d SHA-1: 3d075516df96bf4224a27b047d254d1c1be4a34d SHA-256: db741ecb40bb8638cd1407c30ecce7ed5d8a8170b0b5312e6361026b57dec155
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It includes numerous links pointing to compromised websites, suggesting a phishing or link-farming campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=how+to+get+a+flat+stomach+workouts PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c443038465---xuzuxaxiwojazuve.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0c7d7afcc---wavesokipamigunebuk.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a45928e4a69---derivufalovuw.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad519e8e1e6---88061814087.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/xoxosimudemasazulimuwe.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/84324431073.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/46835098020.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fatetumutasadovavuvasoto.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/46386731370.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/kikepobizajudikunaba.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/75c70fd9678d1d013593f246b496e07d/74871352199.pdfIn PDF document text
    • https://noddy.nu/images/file/golugonitari.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e859be1b---varuzalovipamu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5ed9bd0998cf5fbef3c12b6b6a90bf78/tajorelarizi.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/p7h77ioinhpp9tth0tn300hv85/51686731944.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b219769a508---2673566396.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f5c6272926e8718075dc0f160f0da10/dapebomuvorodubuzalitiz.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/purubakudodoza.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3f96d4bc---48417915711.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/47942088938.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/38ohrp9dtpsklj94jhtqabqpk4/jegaxasujoparebe.pdfIn PDF document text
    • http://naviway.su/upload/files/talafurisu.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/jupibusowisa.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/zokamibatadujipakivajujuf.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wawepuwirekutowopejofefe.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1516c5ae70b130e0a9e844419b954b17/22930530032.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_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 16360 bytes
SHA-256: 17209aee5d2fda08339cdf2a60b1c51d7908378c11e6a02005cb8e4ae17f0eb5
font_01_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 10856 bytes
SHA-256: c1dea0a1961f6a5ca8b504c14c6238b3454f0980819c6db403163f96400bcbc9

Open this report in the interactive analyzer, or submit your own file for analysis.