Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6277f3efdb8a68…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 18:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5c3188efccd023e68d3fbed38d050b2 SHA-1: 559be49826b35d4cb4c8af4bf33c12888210b92c SHA-256: 9b6277f3efdb8a6883cc86cbbe7defe7e757c620a0313607e140cf1d0c8324de
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting domains, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple links on non-clustered, disposable hosting, and the use of UTM parameters suggest an attempt to manipulate search engine results or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://shinex-auto.com/userfiles/file/koxagotuwafalavepaxiteret.pdf In PDF document text
    • https://dancleland.com/img/upload/file/41629703748.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/mavobuferesudewaluba.pdfIn PDF document text
    • http://asfalon.com/__files/file/15560620036.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/86800624942.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a67684a56---57671434068.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080993be7ce8---zobevuzopam.pdfIn PDF document text
    • http://m4krichmond.org/clients/3/3b/3bf4c986be49c21931b3574e72fd8103/File/92798547347.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f395c55d580---betokonax.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090149b8f51a---35026738.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/bubinuzigatenem.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fapumug.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160f983b921448---birokapi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5b9827300296ed9b7dfca3230cd9379e/51787232903.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6864d0ec1---13520853539.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/xapamudofizim.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/6962554447.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/17316994375.pdfIn PDF document text
    • https://plasy.com/uploads/file/82011696156.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25ed5a7388e8d86f8d78ec050cf6f1c5/fudagij.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210722195120_NTQwNzYyNjg5NDY=.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jose+eustasio+rivera+la+voragine+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_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 10832 bytes
SHA-256: 727b299fa66c51684a8db19b4112b0d51bedd1127fe54a23e53c6a81c80dae3e
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 19400 bytes
SHA-256: beb0405ec837f400dc52881779d0c830a7d924c7a75839b7cda94bfd0b9bf93c
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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