Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f7d553e75b6701…

MALICIOUS

PDF

85.2 KB Created: 2021-07-14 03:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92fdec8c7b996c74e04b7bcb577fc231 SHA-1: 44e985727f1971125b3190787b0473d0a15e4b9a SHA-256: a5f7d553e75b6701a1ab23b96f5dd842a907014b576aa96f2e1453b1a9b6764f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=lateral+costophrenic+sulcus PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbeb016d8---midegotewa.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/6073816229.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05765e08bd---punixuxasewebowexome.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec52ba6149---97505595659.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9hgbudu95b1hj76l7kj8iakdco/dujikiwesaxutusu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a857e7dc4d8---1575488528.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/50010674989.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a8f29344eeb093476c6466692aa8d199/gudakud.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/pawerakapawolibufunirawe.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/65584061157.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e5a5d4e8d7bd5e2d485f1d8a5d288842/52107150056.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/pafobapatuvuduvaragosuw.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kekeladapinogaxaputapud.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/88031259255.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084720b17f9f---nikup.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3ddaa31b98ffbc79e114bb8f6e74e8e7/48127763020.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/42782adee5aafb0d8e6fa90586fa2e1f/tefozesefofufixu.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/18182121487.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/89d99feb38fc711693df95e7c5ce57af/besop.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/vcqm8nhods72iumm605j897uvu/74580865761.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/71255970735.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38ebc0d26---nesaxezo.pdfIn PDF document text
    • http://huefpdf.org/upload/file/gamixusuximuxokokobaf.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wirewuxusetiz.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_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 15960 bytes
SHA-256: 18e31f138207d460a36aebb964d5a790a3fe360ce10afe6d0031b52e01a7b2a2
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 10528 bytes
SHA-256: 7371942239ffb8b6e162d3ca0602dd28b1187ce508b4fb9bbec946a74bf470ca

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