Malicious PDF — malware analysis report

Static analysis result for SHA-256 a392a554562daaa3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 00:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9fbd26ebb0b25cec277f3fede0ff53c SHA-1: edeaf1e91c3c21d791a2fac9916da16250dd28d6 SHA-256: a392a554562daaa3bed3cce671f9585b6a8f4d2a90220374d4a7679bee75b46d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=zombie+apocalypse+game+unblocked+77 PDF link annotation
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/24112d3e65d80ea7bfe3b52d657621c6/xufomes.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405af349564---95231144865.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/28005032464.pdfIn PDF document text
    • https://techlan.pl/files/file/40844217816.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/32018928788.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/muviwa.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/fapemapipimoxaneso.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/70761871340.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/16199900069.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/kapidovasaser.pdfIn PDF document text
    • http://4bx.pl/public/file/pifakolutuzutagefibikulun.pdfIn PDF document text
    • https://airbays.com/userfiles/file/24518181715.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/wilikukuni.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/92361833887.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/36540304304.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/jexomosif.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/30971026050.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/72566430703.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/1491793535.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/texofegijapixadigipejogo.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/jiboxesegevufof.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/vewuxubajujigidotit.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/72176881293.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94ef6d9d827b66c3fc69d4fa240e88b9/78593094385.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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 11120 bytes
SHA-256: 8eea8dec56c6342a0888849b183aaed25a01b7722e9330f439d51a53462c6ada
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 17816 bytes
SHA-256: d2c7e15eaea4c355e95901bfdec65d9d18431065e1bdc1da2c6489680123425b

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