Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af4fbf11d41ffaf…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 19:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afe765d3d0978a9c01ea5fb693eaf8f2 SHA-1: 833bf08c0f32d7dee2591db4d6cdbb67ac5487c1 SHA-256: 0af4fbf11d41ffaf992d995e89cf8bcb7f965d9818879be4a9b83e09cb92a18a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it is designed to redirect users to malicious sites, potentially for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=identit%C3%A9+remarquable+3eme+cours+pdf PDF link annotation
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aece5245e38c956149303090d2a06005/mosulonoxowudoguful.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94791681287.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/96505309212.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/61656310b87f49100e52549f0918c7cd/zujazikekez.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/32216806008.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16103ec67246a9---sofakonomumagoda.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c684379e6ee---39998628765.pdfIn PDF document text
    • http://4bx.pl/public/file/6318044898.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160748e420bbaa---zidoniw.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5556ce9717e7165c970bfa989815940f/11447241390.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608703cf48e95---23017987345.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1c9ecfc8d496df35bd76461d1eaf203c/25130430585.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/javunegupunajapawaf.pdfIn PDF document text
    • https://arerp.kr/data/file///77922649516.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4cba7a3d---repilekokep.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/577ac42c9fe00eba9b86f5239fcef7b5/junovakokatu.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/74737346481.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/kokokurojulimupal.pdfIn PDF document text
    • http://fabienneblavier.be/upload/files/towit.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb22c6e76---11807328001.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161065ea89654a---64730979754.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7b8eb98d7c20282acef4dbe13b9803bb/fukoxekituk.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/eea01fa6e1104056b57ef823c16612f1/rimavejoxelikelaka.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/88914176411.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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 20952 bytes
SHA-256: 9ab46bf358ca9fb045e3294cec22cad1bf06f4a9484f24164876761cddd0d172
font_01_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 11444 bytes
SHA-256: e76afa8deb6d35f3c8f35103be12c0b908bca95cba618fe63610c8502f56a566