Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeb97089450dd57…

MALICIOUS

PDF

73.3 KB Created: 2021-09-10 07:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8108314f1b6c8c2112b7a465cc78949 SHA-1: 436a8dea7410bb361da9c85d9938ed1c60478e08 SHA-256: 3aeb97089450dd57c499eed0d16d66d0643ca4b9a6316d3779d8cef16ff36593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a compromised WordPress upload link is a key indicator of this malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alakharia.com/public_html/userfiles/file/90390003629.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/20210910/210910080808177494ceco3makgwmx.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/31023551342.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/peneme.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/99416305446.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/duzonupugufubanapikunulak.pdfIn PDF document text
    • http://355353.ru/userfiles/file/nipedavoxazuwoxi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134872ed59f7---pobulex.pdfIn PDF document text
    • http://skisun.it/userfiles/files/12559065849.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/43942355376.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/pipiwividosezuxesabib.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/vewodinomasukebitosarobu.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/rimisi.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/12798615590.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd5e27eb66---vuvob.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/43386134882.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/77409062697.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/55528031590.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/namusemum.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/23682827031.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131692e4bc1b---roped.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/merelekonilorokaw.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/4523904023.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/grj521cp67fek4bpfrlcrhg1ft/79551397514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+suicide+squad+online+free+nowPDF 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_off0000b700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB700 10896 bytes
SHA-256: 406fc37464489ac43a5fbe5d16b1868a83dfcf28b66293882764ed7ba1055f99
font_01_sfnt_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 17896 bytes
SHA-256: 83732887368fdc772a003d00e70f2f1a3feaa2a2001fea90951e74437b737099
font_02_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1