Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a790524b81c3317…

MALICIOUS

PDF

119.1 KB Created: 2021-07-23 19:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4cb357307c6ca8f7a2ac1d9e020d80b7 SHA-1: cb049e86faeb692f7ad48bfee16f0e1238d7ec7c SHA-256: 0a790524b81c3317eba00e90fce039e3354b1a2253652cf17c4c4a840e7844e4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oriental-kitchens.com/userfiles/files/61928797106.pdf In PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/vonofomikafezakusalimupe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48caae9553---96880743163.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8bt046o93800mikmfsedjb6gpc/mamuwazujurufifixozufubub.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/46950523064.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/76101526630.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0lfppj4rtq27p76lc3h2vd2pf9/17429184563.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71abc288c1---53630022853.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/jawebo.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/luwerabibofejejibu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/jesojefubowisegev.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072720b99eba---26181038144.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f361eab2---kizalafemuwiparokum.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed75258df7---kejafatejo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0877afa4---90959628442.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/foxikujuvikodugejogope.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/migelipituxekipetajaga.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa74b078ce---98084800220.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4870b192b2fbce8a14ad07368467b3a3/mibokozuvubupa.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pvpr5dg3im1p6a55tkljqjvuv1/zulajitexoporisevaxixibe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fd14c921bee8718310b4797996b98b51/marijawunizap.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608210444ec24---74777775648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+are+the+causes+of+environmental+sanitationPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e57acafea7894174cc83c75d098a5e3a/18028857782.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_off00016cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18516 10760 bytes
SHA-256: e9045787bdc6e2f0c39663e05c8195a64b51ac69d4789fbae9dc17f81435890f
font_02_sfnt_off00019daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DAF 18916 bytes
SHA-256: aad82e0cd468488cb29cb29724df56f92583a1065b2b07098d7af033cacd1d43