Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dec909982059d6c…

MALICIOUS

PDF

87.8 KB Created: 2021-07-23 21:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4224458b95e4b0966396581823b4f198 SHA-1: f9f847988b60a06089cb48788e0605ae66d47fd7 SHA-256: 4dec909982059d6c6e6ceaedef7f49b19940f0e41a9184b542ac56eebbbf8b9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or phishing attempt. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ae3f05d8f7961c80cb890828a6e20172/wapirobiwun.pdf In PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/spj445b59vh9scpor2jcs8lpfe/newapa.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/48025799892.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/bexuf.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/luzezavowidinezemimomiba.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/02e852aea27f1d91aa49c7ab5659a23a/sebodikajigudodovajaraxi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a9b36d94186a7b7e655baa17b7439e96/ditazatejugomagufu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c181f7e0b0b---jidafibajovuzujexeju.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082561cdf8e8---sufifefuzozakuluteza.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609495aaee00c---kebevitobisideva.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/22874167144.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e154c97a09---basame.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210501215901_1028750395.pdfIn PDF document text
    • https://combrooncom.com/contents//files/78830533961.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9b33bf42e7efbc381d06052b32c72339/refozakuketoparefatu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d622c7ee5a---rubavelapajevil.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6lnufe98g2uuhm4ni3md9hn18a/91720753419.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/73bd1caa13eb9afadd5c9496e8d78aa2/nafoz.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e2497a3d7d4---83242040998.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/kovanifexelar.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/lopakojowiw.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073beda78453---15791343559.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/70462183476.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/15345925453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+write+application+for+extension+of+maternity+leavePDF 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_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 11000 bytes
SHA-256: 223e17d52338e94d2dcaadb8d782e79fb1d4f33f124ba7eb90b389e52dee4874
font_01_sfnt_off00010cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 17008 bytes
SHA-256: e031d9c50465c2ef2e1906abc5656b414e9e567686f34f2efd747999efe3e654
font_02_sfnt_off00013919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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