Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca34de7eaaef02db…

MALICIOUS

PDF

91.3 KB Created: 2021-08-04 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2065b7496e108652fcdc706d76b679bd SHA-1: 8c904c7e0d854ee7a5f9157b6f74724f56977305 SHA-256: ca34de7eaaef02db655a90610e7dc8f7d483ecf888c3dd8bf5388c23ac18ca23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm on disposable hosting, and the presence of 'utm_term' parameters suggests SEO manipulation for malicious purposes. While no scripts were explicitly extracted, the nature of the URLs and the heuristics strongly suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=how+to+convert+a+pdf+document+to+pages PDF link annotation
    • http://richmore.kr/uploadfile/fckeditor/file/xoxenexa.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wuguduxagidigasorumuxa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160dac333c6dea---xunin.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/dazodejajeretawedi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9hma4486sgpdqejb6h656l1v73/boxor.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/45124393116.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/3033906628.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/luzezugokagosi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf938bc22fb---lusovosezotanodupaf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0ded7d5c---21068062179.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fde5a5903241e11817f94e8d45eda0fc/30487513749.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/39153640970.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e2c7a457---35299605674.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/mitulewedolaw.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/20272367756.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210722_763323F54C6E1673.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870ecc7bc29---bakolimawepalewazaku.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0a12bcc9e---50685378135.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/9330678615.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/76546513270.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f520c01b9---61742411751.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/43368294739.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160891852e1627---fefipod.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_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 17016 bytes
SHA-256: b68f5b7f0bbfdaea09598174eaa308f51020080e1aab06316d0e73098fe050ef
font_02_sfnt_off000144ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CE 11068 bytes
SHA-256: 0d6b399b993e8941b6f965e9313c7aec09fbae77899af96dc6c93fc49fd2b852

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