Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ca181a702a154b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 05:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beda52f4a53d01d4136195724bce7f65 SHA-1: 6d2fc7f25077eb870dde3eb0bed535a2e71c184f SHA-256: e5ca181a702a154b09204faa7551898c2ecc21e17b51301717fae9f873b8642d
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further clues about the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=lokicraft+2+skins PDF link annotation
    • http://fsnmmaterials.com/UPFILE/userfiles/files/xaxurezavipusifus.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/50988014853.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5333ba9a0---povafoluvorimetejonul.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5007248656.pdfIn PDF document text
    • http://xenangheli.vn/public/files/somapavojivitojevugu.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/2877473512.pdfIn PDF document text
    • http://chinalabware.net/d/files/dalake.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/basuxawim.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/18549196170.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/babilapalobijujedakuta.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/xejibefe.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/12197933902.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/batuvatosovetoxazenoden.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/wowelavuviboza.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335fee07b24---78369793676.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/nujovabafefejitagot.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/gasuloxosexigosubajok.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210903234830_1892198395.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/61123713709.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/tapojuziwakubowuteren.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/48321296290.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161418d98e5866---79655107005.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/dujuranagufifojokujaka.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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 17372 bytes
SHA-256: 286d1d48ffb1130e2fe8150ddb3c584ff099886bec615096d7d0cf9caa29fb28
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 10320 bytes
SHA-256: b37507153ee9526670d7ba996e0bdcb2facd03036cc4121c9abcebe95e8047ad