Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6ddb0bbefb5bb6…

MALICIOUS

PDF

164.9 KB Created: 2021-07-13 22:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a80fac38cc1dd1abced86ddce2aec19a SHA-1: d0ee1987cfa22a1fc0c1b0c16c3393a255c45a59 SHA-256: 3f6ddb0bbefb5bb656b81cbf04641ab36b9a742bfa5a5a849fd9ef1310fc9460
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are used for SEO poisoning to attract victims. The ML_NYX_PDF_MALICIOUS score of 0.991349 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8kv8nqb9t5sku90stgu9hqhsb7/rebeludawi.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/samudeximojakijositipi.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/vadewezeten.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca22f73111---pajajobe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc7084c9b---sogedobaminibuzewofoz.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e39cd00ce6b---jeziwireratijoxuru.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/kaxexejemasosedozekesela.pdfIn PDF document text
    • http://www.celso.org/download/57854770770.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/vajutigowanudo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d772a7c74a1---64343095466.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/88448164838.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/23b4c948e4e38b925687bdf99b48cb52/55708188237.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/7144867250.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/13215212529.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/tuxugetazapum.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/25151729279.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/t6kqllqg87ciiuv70920tqlh60/figedivutibogunizane.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/27181238175.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607649b4273a0---zutavamodavuzife.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e9092f369---fabuku.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/adc5302adc129ccc79f1c50478bf4e5a/78576252595.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a6aa253c---lafokoluximag.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd38a8108---dukivevetogajiveluju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ultrasonography+of+pregnancy+profilePDF 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_off000222a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23ABB 10880 bytes
SHA-256: 4414a835d81613f6fd6a4a499e2b9a655d6e7ce20f9645addeab34e1f670fc5d
font_02_sfnt_off000253dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253DC 18484 bytes
SHA-256: 712cbc9f0092476d536a07cc3ec3b94f8b69354c731842d39c744501a8cf3ae0

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