Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4efd7197856aab…

MALICIOUS

PDF

69.6 KB Created: 2021-09-13 19:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d54dccd8535f637662b47849fbe7cfbd SHA-1: bd6371974c6204a284767857dd0b9594b3706a3f SHA-256: 4b4efd7197856aab04e7a65a6afc0ed4ebcd0364619669228d50d3dd2ac1d3bf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised upload storage, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests a broad attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://paron-rebondir.com/uploads/files/gamewowizodipagaz.pdf In PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/tabezovevozowubanoga.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/85000649347.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/36545501796.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/87362415905.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372381cf41d---34877960282.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/mulovosutitupulaluzijan.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dowizi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/66802651043.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/duxipuf.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/nofulaxixukukakutexuv.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/igofupowukanura.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/gidujebomobepowarofi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/32370090783.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/90658270868.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/58415685526.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tilexamu.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/6953423095.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/72851480094.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210912050337426.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/62346337242.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613897887f393---ripazixopabelajakat.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gvua9untd6f30iom0r4q36s767/18621863260.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16220753996.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/34118448124.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/xikalenige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+save+document+as+pdf+on+androidPDF 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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 10976 bytes
SHA-256: c5e46283effb533ce5434ac20c59de20b5561585921bdea8dde55e162df29f79
font_02_sfnt_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 14540 bytes
SHA-256: f8864802b7f669b363dfccd43fe81e2ce86b16b73dd3ca601d0a6d7c32328ef6