Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dd52f8a0420252…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 03:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfd428eed1d5046ede01ad07d6df4bb6 SHA-1: 9200ddeebd3360c6cca6c666fdc6ca7465d9a9cb SHA-256: 08dd52f8a0420252e967ba682eb131d83b615dfb37644dbbdd6b4ee745e357b6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various domains, many of which are hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://szjglaw.com/uploadfile/file/2021090808334373499.pdf In PDF document text
    • https://afmiletisim.com/resimler/files/46917348050.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/foverubirobudutalobixikun.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/77687757734.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/sazawasasirekananum.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/95284669201.pdfIn PDF document text
    • http://koutingchina.com/upload/files/8292686050.pdfIn PDF document text
    • http://htygroup.com/upload/files/68343598070.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fedevudadogoxiwufuxabuli.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/gesexotubotilegali.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1504197309e8c8601760d6c9343ea6f9/59843841754.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465e96532e7---fuxavafuvul.pdfIn PDF document text
    • http://com123.vn/uploads/file/tofufi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ec35bf0354447b6302d1f2bd982b2912/23587564478.pdfIn PDF document text
    • http://www.celso.org/download/womigiwalamoki.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jipuvewufejowozobowotop.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/90119891023.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/21630960815.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/lanupel.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/20598940745.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/b6eu5ijm9juj14l2bv5m901h36/wuxixi.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/tobibolikobawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=garena+free+fire+the+cobra+apkPDF 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_off0000ba8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8F 10636 bytes
SHA-256: 4de589e94e0206a1298d612ca3f89a8e69d1b8c1d337938a3259a4853c0843a1
font_01_sfnt_off0000d299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD299 16408 bytes
SHA-256: c93bdd95b5046ff7bd1d70c78154523bf80b7ff1da0537c307308e34cc983318
font_02_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1