Malicious PDF — malware analysis report

Static analysis result for SHA-256 a294fe3e959f45d3…

MALICIOUS

PDF

71.9 KB Created: 2021-08-28 10:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c324511756d26c35937ee0739ad47e7 SHA-1: d91b2d0e0227539550ff5a8632bcc9c1dc9b0778 SHA-256: a294fe3e959f45d32f356045cb697ac8071aab14af6e83d6f80e8b17681f745b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kheops-so.fr/ckfinder/userfiles/files/mimipunelabu.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077600584de4---renoretudivatuge.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/23349010350.pdfIn PDF document text
    • http://maihome.hu/admin1/file/10466526908.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/tatuv.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/juvolisajasodonixaxapated.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/99289153885.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edebd89f3---xapekemaxaporixari.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/8553802216.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/vezexin.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/93324402154.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/ludowesojawum.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/joperixenemovenufebed.pdfIn PDF document text
    • https://bio86.net/fichiers/migawugibuvekukup.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/tukis.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd2925e09---28781186160.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2aecf6a3---56339583837.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ba116ca9---56121577227.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jhu4lvfpct1i5atjtk2fujm061/goniruketumozumavowo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf351a2a3---68909605324.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/kelosagajisolu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d060a39c991fb74d32f5600b63c7b720/85594845400.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/52523793926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=toilet+slowly+filling+up+with+waterPDF 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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 15172 bytes
SHA-256: f7fcdf280a5fe5c728d34d779bfd27ab4400e05f60164476e862930a3e3525f9
font_01_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 10900 bytes
SHA-256: 24b35ab9f1a7a575b06be45d96b4eb38104bc12450b13e8cd2fb19e17912895b
font_02_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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