Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd59244d0b36e70…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 01:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40faba451b0e02b5132eb58bc7123e72 SHA-1: 39239f09a98aee0ea7fe132897f50ccd22c9f061 SHA-256: dbd59244d0b36e70062f9d7b637807205ecf5ab5c08cf5614f684daf9693b3e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the nature of the URLs suggests a potential for further malicious activity such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nocenzura.space/web/img/podborky/files/48929140192.pdf In PDF document text
    • http://alompar.hu/uploads/content_files/files/lawaganufis.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/84789652518.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210906_BE40DBB604CD8778.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/zagonovurufugu.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulilaxarubo.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pupodaberuji.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c990e8d8c1---40652248273.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/63416306489.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/78226256195.pdfIn PDF document text
    • http://licausi.it/userfiles/files/45936059597.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/gipodekisogedub.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/67918705761.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9215d258---vijewoziruwudikolix.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/27621644154.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/uk3r9ok094s54m9032dm6fibrk/jigusimo.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/mugaxowuvomivuditax.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/fugefamarerena.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/8445689968.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51452d305---7848598258.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/84890214208.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/61700915161.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/kobodiga.pdfIn PDF document text
    • http://esejsc.com/upload/files/80561459209.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/36863486200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cara+merekam+suara+telepon+wa+di+iphonePDF 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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 10964 bytes
SHA-256: b5fd2b84ca12968fbbfd8f7e62c74549a42c4028f9cb18b1578086afb7d754c4
font_02_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 16632 bytes
SHA-256: b37e6e769941639cd2b5fdaf9d1fd0f44ae1d25955a51f39b917084258671eb6