Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6d7499a4e6b48b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 03:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9407a92ae6eb44dd838c52704c03f9bb SHA-1: 0ea0738b14d5d3e4a5162393efe8283659feefd4 SHA-256: ea6d7499a4e6b48bbe69957cb22d3c14d55323b80a846613ec611da963902fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a redirection mechanism to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://auchli-appenzeller.ch/userfiles/files/84156469523.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16129444e6be63---78681698168.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/24028858660.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/degiluse.pdfIn PDF document text
    • https://tavio.ru/files/file/19020902464.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d0be5edb3dbcb0699cd755f6323f8482/bevaforesabiguno.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/duwudamofipikawe.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/51206845415.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609821b6729c9---72677367781.pdfIn PDF document text
    • http://pvvc.cz/files/tofoxaluwupeditagi.pdfIn PDF document text
    • https://luminex.pl/upload/file/mesipabemidanafeposo.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/sefojemujivinijuzafexoxi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/xilijemilologajez.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/vuzilubewaluwa.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160874084224fa---24194517156.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/devisutazejuwegukagebumeg.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/kufodanufedo.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/70629149703.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/103da05a156d8613bf3b0d10ff462cc1/38993519883.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/mekizefatezafota.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a3628bc95---duwaxesasunazedip.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sbuq3cgpc3d7m0jegh0vr88si4/89949733687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=only+ias+monthly+pdfPDF 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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 17604 bytes
SHA-256: 54469e0f8ae12c37e5d03ada30e48dc79fda9e23e9a05a6b83c1c89b8ad26f22
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10672 bytes
SHA-256: 79f50a8abceee00961b9d56a1359376bbc7733145957a5e8df654103e3323dc9
font_02_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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