Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa4c723bc1edf75…

MALICIOUS

PDF

95.3 KB Created: 2021-06-20 16:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d9a455a24aa0436f27f8b740d4d05ad0 SHA-1: d6f421c963373d4a1fff0abd4e50cbbee0db5e01 SHA-256: 7aa4c723bc1edf7508f49d979a7f00c3fb7077cd5f88f06cf6e05dfc7826d1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various domains, including compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=best+skywars+server+cracked PDF link annotation
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/74b576ce898c91f2e5f460f4f09cadb4/xamanovejifuwalaxebuni.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/aefed3ef2c1ff0233410a955628159d9/23974840325.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/kerosokawomo.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b8449d0cd277dea5b8457a85ea63e3b7/winuvotasib.pdfIn PDF document text
    • http://abpaluso.com/upload/file/degojimufuvorobox.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9be500a107fb901de93db06bdb5e3e7c/bedopegopuvuva.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8403908f2f---lijevanexonipudiso.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3162aee742---vagozoxiwotodiv.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/efe89082ae1d1200e229f9d4681c3711/38709404709.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/fugugopewawimalula.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/sopakojelalinodevigupoliw.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/nobeguxirifuj.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/069333b028d0745e9e4643f3fa94a572/51198315029.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca9e7b588---xeritukuzisab.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/sepirakaroxidepiti.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd5cb47ed---66242079661.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/jerogaremimikejafukirozu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c037934601---wuridozodikugawane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 5268 bytes
SHA-256: 39afef632dc30e608989f8661b721faeaac4b365186cd601305dd14054421899
font_02_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 3816 bytes
SHA-256: 113711ad535362120a9593a6cdaa662c462075871b20649e4ab61442f59b63c0
font_03_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 17376 bytes
SHA-256: bbd9030a277a2cb298687acf4f2ec1115f00350e1c187e142855b6f5ecf27246
font_04_sfnt_off00015912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15912 16324 bytes
SHA-256: 999ab020d9f8e5576399435fc7920797379016e2bcf7064542ad685c8b5ccb4a

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