Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdeb111aadca6f9f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 07:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f6c364806f610d348f5044122368073 SHA-1: e1aff5b14816074852428e8c8a3424c5e02de432 SHA-256: fdeb111aadca6f9fd4e5343aee5547cac2a701ea9fb8221b1b1b0e8b4eb23a9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings related to link farms and compromised CMS uploads are significant indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://coming-c.com/userfiles/file/dukalupilalowope.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ac021dc2989bd855fa0e085628a20484/12652056177.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126349821a7a---wipudopupo.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/xodubejavijemegisevexi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/20e14eac796a6800903cffb0dc25737e/boxedadirifufup.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/tilizilewib.pdfIn PDF document text
    • http://teraval.cz/res/file/87033315772.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/23182043255.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/tofewe.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dcdb2a4afaaff455cf4f4334fee840b4/pevopiretasufudoxizu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2481105e50---ditepusin.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/95416185603.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9hekb9l9csashk5b3od8e94nku/nokibuwuxulubumew.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/pikebudugawev.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91965d662---41766493715.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xufavolejezuluwemozoze.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/amobnc765beqslpqpckc4h92p3/27412516537.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b92dad67---38858252921.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1b53ff5f---32246790693.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094668b59f7c---kowarijisibotaxudexa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072103b7c3e3---68748283585.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/91319959437.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/xavuvarul.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/13339376322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=shotcrete+mix+design+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_off0000ce78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 11036 bytes
SHA-256: 5fc4306aa6643fd678bb1c98d307ee0e613657f8f3bad4257a78c06cddd04b80
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 17920 bytes
SHA-256: 90ac54a221c88faec2265b878d1ae9364a19c1695701509cd8158e6fd1387e27

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