Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7147b5fef259e02…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 15:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0fd1ef2bdd9f6344ad72328cc728df2a SHA-1: b7057eb8069a4a6fede85391cd7184e95ba46209 SHA-256: c7147b5fef259e02269dce77160e77fd6d904e14bf74aa1d479272ffd75c464b
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=video+star+for+android+apk+download PDF link annotation
    • http://baiduvpn.com/upload/files/72962076208.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/devadefupuxede.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/37312600036.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/numasonumif.pdfIn PDF document text
    • http://abwessex.com/uploads/files/30426938786.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/tejikulunakiziteza.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/3316288083.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161316fca65ffa---finaxu.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/62988260839.pdfIn PDF document text
    • http://ropesadventure.com/d/files/94155384555.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139c74d84434---bifobiganolisu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2477fc22---senodusetekemarop.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nirikusijururuj.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/97185841722.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/29711860552.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/88900704769.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xiwodorerorobibitadu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/7660746405.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/jikix.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/tajexatarudugape.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/rafag.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/89640259321.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133e29025524---47711934599.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/vamuzigapo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 22500 bytes
SHA-256: 74c71e1423fb2bdf0b183909a4385237680ced15506c707e680ec79dacc78c9d
font_01_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_02_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 10636 bytes
SHA-256: 758c4a2e36b1992aea53365978b4056f6472a96c8a3bdef050df33bb46d4b997

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