Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f8b5fdeb1ccaa2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 10:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c3cc499ba254a2739139ca3d678e3220 SHA-1: 2c6c9911143708fd57dc6be7413b29eb85bb4224 SHA-256: 95f8b5fdeb1ccaa2165ddc39b3fb6d93a38de0a029d3002b6ff4b5d1742bbc52
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other potentially malicious content, likely intended to lure users into downloading further malware or visiting phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7e31c4c0be6c6eb8ab0f34f83e85b27/79557082863.pdf In PDF document text
    • https://flyags.com/editorResources/file///88968397811.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/3691595811.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/nowuxibudefaxizop.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109207f4a3c7---20929663733.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/sakufepivodubit.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/74118608375.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97ed7192c5---25420555000.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/19145481797.pdfIn PDF document text
    • https://cityface.cz/res/file/39785718195.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/wemugujogusodima.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086e081a2000---80976837610.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/65586674894.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/jefegifeluvexud.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/24164582095.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5c4834d8---7120170556.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/rotefobapoxised.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16084c285474e9---49561637500.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/16617915722.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c84e7991d59---46070146810.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210629_3AEA60448AE6B01F.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/zexoduxal.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xuvapebasosagenukez.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf7e9f622---vidorolo.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/78970224074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+embed+images+in+illustratorPDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/20037700744.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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 18068 bytes
SHA-256: cc7838bbfefb24af1646773b949e85a7467f9cf7b89d66639948b74f17607c63
font_01_sfnt_off00012481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 11020 bytes
SHA-256: 9107727afc958b43ab1aec468c1c936890c966762ee59714de3a035f62b1f1ae

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