Malicious PDF — malware analysis report

Static analysis result for SHA-256 108ffabac51314d2…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 14:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2b2666828093dc4cae56b09e49e71a7 SHA-1: 72e652c1979744a16ef5c40f5c8f5e5d118757f1 SHA-256: 108ffabac51314d2636c1873b5567d36f36330dea33d319f4174c32b5d26128e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the nature of the detection point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=splitsvilla+season+11+episode+1 PDF link annotation
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614020c1436de---dafaligonurofileb.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135068b645d4---91131674447.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109071844331546.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/vawikirabufed.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613248e87b1ca---83839638880.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/30974466805.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12bcaf644---wupepujirex.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/rurigikewuzadako.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/vemimakekizuk.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614039171d5fd---bimeniwimarunodevor.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfde176f7---vugedefeperujevaruna.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/gaxajajevolosebuf.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381e7ff0617---311953558.pdfIn PDF document text
    • https://tipresentoio.it/images/file/59263497387.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/fatarat.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89831141---95152284617.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/fizil.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631043028.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fijulixixomefat.pdfIn PDF document text
    • http://stl-hk.net/userfiles/murimuvu.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/wudajeteturigitupudebem.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/deluxofumikovurubavu.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/55788225724.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/lowowogaralidumolazi.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_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 17320 bytes
SHA-256: 78d06589e1dd174bddebf2564fbf8ef0cb57e9699a9b6efaf3c6dff96c7a8bc8
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10476 bytes
SHA-256: 7745ba72e65e58b07accf88f2c1e3765ce8ab0fd6231999f98f5aba1f3664c5b
font_02_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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