Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc9b9e86c67f61b…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 04:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 829a589eb3adbca14be1eb67adb96076 SHA-1: 4de398fb74c9c6d33e45920f3dd35e4d29242b1a SHA-256: ecc9b9e86c67f61b4fe30c161d98593a0949c5b144cfa03cc7a7a4f9f5b5150b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0248e5fe121f1f9e23b5ecc060f6687d/wenew.pdf In PDF document text
    • http://elcivan.com/admin/UserFiles/file/bivumakirututokarakexe.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/figiz.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a0df6af33180d10ab24f6930cbb4ba5e/78196833290.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8f4f3cecc131194367eb063b0b8d9981/23073521128.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210628042554_kh437n.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d5df878bc5b8b51bb60b13cc2ac6112e/92881146563.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/faponupelulapex.pdfIn PDF document text
    • http://sakem.org/userfiles/files/rowezamatime.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/mazigefuvujajenegabe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16085e883b6d20---bisatadi.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/19604169498.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b5a33b108---66425003513.pdfIn PDF document text
    • http://timapools.com/uploads/files/60373604616.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/96391209828.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4f09ac42---fanefojazaruputowur.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/zorinu.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/84119148866.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/e984ad20cea6ed5f61055772e59bcbfd/20452382757.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0b81j9d5bnsu5uitkasorhf0ts/luzolu.pdfIn PDF document text
    • http://beauty214.com/uploads//files/202108051033364957.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cbc97276---todalibirajek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=behavior+monitoring+chart+pdfPDF link annotation
    • 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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 18016 bytes
SHA-256: 520b738e974db420ed3e040c3c7368e8d5c64deb220753969be6811583f9492a
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 10972 bytes
SHA-256: eeadb846fd5ecf52b5d4c873cf4156b75c410be20b03abfed60831d1a60b38c7

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