Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd289fb2321248d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 00:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5a83c7f2159a0e13274d0ebcb7a2896 SHA-1: dcdd4984b39e97dd1d263a3bb6b4d887d39a6c49 SHA-256: fdd289fb2321248d8a6295133dad85c82738ca44310f13c3dc86e26c5682abd7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics suggest it's a link farm on disposable hosting and points to compromised CMS uploads. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=new+version+of+justice+league PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa836ad6ec.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/fijebozaxebiguvezewap.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0dbd18d16643c9914c9911b1340ea13b/xunuduwogofikaguzix.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/mubew.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/61223811482.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/djg30nph78emgvj56go9o4q63t/migikazanekixavirobag.pdfIn PDF document text
    • http://labotinnghia.com/img/files/52546211414.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/71683258887.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xisututalepijenizadak.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/42179331299.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/lutemomifisa.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/96322715512.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/witudusafazulos.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614089b329354---70520600725.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/gujunadowozu.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/tuduzazegoramonabix.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/16418757916.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/68434121789.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/varerimexisivusa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d178b33af---wiwanopomu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/88034280876.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/69210724196.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/zakozifapazoxal.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/63472380029.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_off0000bbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 17808 bytes
SHA-256: 1ed426a658d8be78ff88e3ff53922d9938bcc9023766c067dd8e48ae693cae17
font_02_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10868 bytes
SHA-256: ff9cf5c96b21fab04636954e64670ae3d5d10670b0b90014e8cdf4db400e3cb4

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