Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb8839f40324af6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 10:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d1fbe9b5fa32a201d9ca14e629760445 SHA-1: 12d52841991bfd6ea56da3a04647627205e6af49 SHA-256: ebb8839f40324af6459c2d767365b7d8ccd9d09f6c7fbde688a70cc66067eaaf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains flagged as compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document used as an initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://romovi.net/sgi_userfiles/userfiles/files/beximifi.pdf In PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/7106787249.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210921090608.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/56080616352.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/valoxaxegulaw.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/pipulari.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/zerazovodejitufuvidilos.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51f34a171---fatupu.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632310713.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f29887c12---87314607110.pdfIn PDF document text
    • http://teraval.cz/res/file/45086024752.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/diduboj.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9o36vbqlr12nqv3afhm5krmskp/63497815374.pdfIn PDF document text
    • https://yodobashi-church.com/kedusitisatinixajapera.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/85776618772.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pofakefenaxifonekezo.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/25411123946.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/53361221787.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/70757019884.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/namelalatubotejawetaji.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/fiworobewu.pdfIn PDF document text
    • http://suurelepa.ee/data/file/32313056324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=iptv+smarters+apk+for+smart+tvPDF 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_off0000add4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD4 17032 bytes
SHA-256: b4b965b8ad7a56f42f5ad066d1e7ea58601181564982957b27b9d5c9c7ad96b4
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 10388 bytes
SHA-256: 9f9316b45b43ea0e4ffdda5fff783d44d156c78152daea3d5d77fb3ddbced468