Malicious PDF — malware analysis report

Static analysis result for SHA-256 3930b8a0c51458d4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 16:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3186d7df2635f0bcc84a5fce16b09887 SHA-1: 113c7cec0224437d64839d6ea9de82dea2582326 SHA-256: 3930b8a0c51458d435c99b592c8a3dec5627a3ff0255a9e7d583105fadee266f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farm patterns, suggesting an intent to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=cheat+code+pokemon+fire+red+rare+candy PDF link annotation
    • https://sgicorp.com/userfiles/files/91950417400.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/faveniwoxelimarapa.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/mobipetu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/9f06b2c3348d1a3e5bb912297c64ba33/25797421823.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/nikipagakigubarasu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b0bac44f---ziwowurawalinumu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/36523007224.pdfIn PDF document text
    • http://sbairs.com/datas/files/70952930339.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/tatujaxarore.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/16149230052.pdfIn PDF document text
    • https://laps.pl/userfiles/file/vewipixufilepar.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161479e1270814---79381749923.pdfIn PDF document text
    • http://specialcats.nl/media/files/22863018803.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/xarufu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4612395196137ed582fc8f.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e4df5369b75942ac8d04dcbe0218768f/sotexekij.pdfIn PDF document text
    • https://istanajp.com/contents/files/25541075203.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/mupawa.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/11559709289.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/wazotom.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/37156153126.pdfIn PDF document text
    • 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_off0000af8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 17708 bytes
SHA-256: ee63a9f4629916dd9cdeb14b02e9736d0cee310d493c4f771e97890cc3e5d59c
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10908 bytes
SHA-256: d5bcfa92b6c9454d993999fe854277d8fa792f564eaf875ad825fbe0a6f19793
font_02_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1