Malicious PDF — malware analysis report

Static analysis result for SHA-256 843800da530e3dfc…

MALICIOUS

PDF

82.9 KB Created: 2021-07-30 21:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f77623f6efd3fdb08149c99bc07fa4cd SHA-1: ede1fe8ddbe7e9d402ab0f120d308ea521e7f276 SHA-256: 843800da530e3dfcc5c47f5f561ab2a31fb8e2a1c9f20e34eb49d544622820d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM highlights the use of compromised CMS upload storage. No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=different+rules+for+blokus PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c267154c085---19633919769.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/86055349829.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c2166643---33886991515.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/53510969831.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/43097943201.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960b64739a4---manepikijado.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9bc661d1717ebce8e30f3617ffbb159e/2248254578.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fo6bg16p9joa5p07ih2khru5v3/donegadomogapu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rs7h58911cr0q0k5ece06cqiiq/46504045769.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32c31aecb---satemataxovabujenimi.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb40e035f78---1359625793.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/kabuzibomizesijikiwu.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/pidibanibunapowamikowi.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/kuvevob.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1d2ade0f44ffe05d6fce8443e99bf4cc/jivevemipexazirun.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/zivubazopegafupu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077d5e1184f2---wonaforerojejosaro.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/25618308189.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/19818437911.pdfIn PDF document text
    • http://renovator.cz/files/file/pamizenevapuvagak.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f34d09a9dbc396e6f7900f88b24e0b63/45169099829.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/92089699287.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9e267a302d7d031cf41739deb379deab/95950623634.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/wekotizojomivexewujilofuf.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_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16028 bytes
SHA-256: fa49837471a190035aa4eb0ed1bc613bb5b93b6525836cd2a576de0f39df161a
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 10376 bytes
SHA-256: 47ab2227935bc8e34a8bbf7353b6f93151d87908509a434ed245773f2715f576
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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