Malicious PDF — malware analysis report

Static analysis result for SHA-256 5139c7f6e90f9a75…

MALICIOUS

PDF

90.1 KB Created: 2021-08-15 23:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a61b89575931a52078648f1d4152c73 SHA-1: 8bbe0538d7be6836355c3b19c0a7bb612972c9b4 SHA-256: 5139c7f6e90f9a75cd37fb4a30c120206e38acb89fffc80513deb1e5e8817a32
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://coretry.ru/uplcv?utm_term=descargar+dragon+ball+z+budokai+tenkaichi+3+para+pcsx2 PDF link annotation
    • http://envisystem.com/upload/userfile/files/zodutebidufexome.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2e59f4b0---49149877946.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/db3bb91bc57cee50363a133ce54bedc2/60710616746.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/japifawewopu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/snhku6t2j041cpl3ug4k7h7pr1/degudomivuxerinumotetiju.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/78dc89682d591a65911684e0d12456be/fapuguvot.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/92a7j7i0qn0ekuedda8lmb41m5/38747926650.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/39140119493.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/lenuladazudazixuzi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4fe1517ad---80041766916.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bk279cndvr0rpoirtmoeqfhple/dixanobaj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3c5eaa4cd5dc48eb149a3880663f3f57/junujezoseziki.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/79594065422.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1327270bea---86574857229.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a40e6915---51774077186.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/89938572703.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/86662739087.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/gotowavoputodid.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70195064096.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611642030f826---wufigonafomojesila.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad1567e11---sefiberigekojapofumoki.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d048b385c2d---37632638424.pdfIn PDF document text
    • https://path.mn/userfiles/files/31554166176.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_03_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 20092 bytes
SHA-256: 018bfadd6c592f93ab69e85951b8042c85c05c18efd988b903ea996c07093198
font_04_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 11580 bytes
SHA-256: dd735db026610bc92982089de8480027ea335530ce600186a272e33f593103dc

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