Malicious PDF — malware analysis report

Static analysis result for SHA-256 b923c993e5dcd8fd…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 22:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dab19a72891523e566f51cea64797af3 SHA-1: 9a98023b14bc822246ca22eaa99f27f354de68e3 SHA-256: b923c993e5dcd8fdfc76f7d83aa1823ee127655e2b5d89c318a68127a7b9453a
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, which in turn host further PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content.

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://allytemp.ru/uplcv?utm_term=you+are+glorious+and+worthy+to+be+praised+lyrics PDF link annotation
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf822c7437---gofizowexigoxo.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/zepukemowite.pdfIn PDF document text
    • https://sce.tw/uploads/files/60d00232ced36.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074a9a74ff20---vejep.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831f60264a6---3674222415.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a8c60df2---72609134020.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/panizinenanisobodafibibu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707876279e8---lusuraniv.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36ea473bf---87912087341.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90e381691---ganiwijokojevajaka.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rra0recihhd04mfprp95mm8ip1/najemadadobabigisukokam.pdfIn PDF document text
    • http://bhs76reunion.com/clients/e/e7/e717e6e8e39ea4daeda922698d41f3c9/File/34572492229.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abfadbb938---jexupo.pdfIn PDF document text
    • https://goldenapp.net/file/tomugevodikakuluzafamumev.pdfIn PDF document text
    • https://bloomeng.com/uploads/kukagezazevegibotanomuga.pdfIn PDF document text
    • http://hydrem.ru/images/file/64788422376.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3cc1031302ea7b74c65099f771f9353a/mogunenisazo.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/xedemexiwizeseji.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/vemijiporipadogor.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/325f82c41aba5b2211073a1a3d3048b2/49345652875.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/metofoladiji.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/47bac833a453a050e30606b953fae2f8/45665610340.pdfIn PDF document text
    • http://cocoal.com/uploads/file/48547545109.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/40352832633.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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17508 bytes
SHA-256: 8a6e07c3c96eb93a2991aa93aa61ed4ea4d0618e8a43ad386bf2e6606529e197
font_01_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 11216 bytes
SHA-256: f0ca73ba04b4e7f6b355e57d229a206d5eb94c5b86c61f3ba72dd4a42f5c7490
font_02_sfnt_off00013ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.