Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f6287552a77b89…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 04:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2eff90f8bb459977a7ae8dde46359eaa SHA-1: 366262eb621592f31cc0b3ebc4b1fb7a52aca227 SHA-256: 99f6287552a77b8915311d540ef77efee34b238cadaa4730aaf454899b7e9d5d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or associated with compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://quiltingacademy.net/fckeditor/userfiles/file/gunipodorapeko.pdf In PDF document text
    • https://travelsafeway.com/userfiles/file/gemusafuwotevamolavi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf6200e37---kubali.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/33339710698.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/pugije.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/77976423613.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/96698212783.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/15250215877.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/91771282738.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913065257175.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/lamegejowonilibutavar.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/55850205948.pdfIn PDF document text
    • https://rajakedua.com/contents/files/jojinegisujasemuse.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/99078226234.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/29qnv1qk36qe8iopedgtk48n66/89702058770.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148557814e71---kagaxovutevonova.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/medoxafesijade.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/weximew.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ead30e263f6654959283ee4a2bc03ac/jikaminoni.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/60833409357.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/84252641100.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/muviledesarovodododomelep.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/vowulodaxu.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/13768940511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+music+on+an+android+phonePDF 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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 17620 bytes
SHA-256: 5e4ecd3c5e590032d725d21de7b73014a6c03bf231212347c47ce56e0a18a8fe
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 11092 bytes
SHA-256: 5b268abf8efcf82c4ab20235327fd8942824d45c7053deaf527df817e6e87475