Malicious PDF — malware analysis report

Static analysis result for SHA-256 1081a4cf208b8ac6…

MALICIOUS

PDF

92.1 KB Created: 2021-06-26 02:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf82079992374f04547e2d813eda4019 SHA-1: 839d285c5efd5ad5d483384b967e7d330540cdb1 SHA-256: 1081a4cf208b8ac6da84deec55a3890786f49d3433a1637301d002207950f8b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3d3ce07d50633fe62dd0a05046c8768f/fifuximajajume.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31f78b29f---6841631626.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/lijujexiw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e8f12528668ad6e410c5c6f9830ba1fa/4981341401.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xuwuxadosaz.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78460306c---89942843526.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475581f6fa---tapaboboxojebodujuk.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/h3dbknr3l10v9v8v07tf3ldbru/diwakimu.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/3ac629f22e5229ade3e2bd67ca24d8ad/tazafuxipodiw.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/23793942716.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4hidrmrb04e2j3osqle1u824po/48340423182.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/logineron.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/pegulavipolatuzenamig.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/wakuvanexesopik.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/59648661737.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/28577885911.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7e3d1823---21189499933.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/99f957ae94c25b79e148c71f59811c61/xukapekupapato.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///nuxedur.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/759ea0dbb18c15e597dbbd2cf11ca2c8/57665277571.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qmjqd22r9t67sqkvu9qc6vsrg3/654800558.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5c5bba92---8958242326.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa3f9eee5---ximakexigilejujedi.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/novonojodixevasazagoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=foreign+exchange+questions+and+answers+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_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 11264 bytes
SHA-256: 1bf755faad1b8857fc7850c330fe35621ac1ddf29a6470a7148207ef57d8b458
font_02_sfnt_off00013460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13460 17852 bytes
SHA-256: 7dd3137f5bb02dbea8f26990a2c38d9c91cb188d461b87a2cdb8e0ca356499ec