Malicious PDF — malware analysis report

Static analysis result for SHA-256 7665e3c636d37cdb…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 19:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6058bb354810e29a6d420e8028fd011d SHA-1: d5329dcc9b3053453b2f74b62ee63cc9ef1db25c SHA-256: 7665e3c636d37cdbf691e91536b40f940fca7939bce489227851f1fa3351a37e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=best+android+apps+all+time PDF link annotation
    • http://kuryakyn.ru/userfiles/file/54279134624.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/silukafoxijez.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/65369788822.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109011028152098.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/17193175850.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/najajotigufopapuwewipi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3883f16e5c105400363f8c4e00853abc/32417493230.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53689487293.pdfIn PDF document text
    • https://computerzone.pk/file/majumutugolot.pdfIn PDF document text
    • http://robedecreateur.com/img/files/didifesidiji.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/65229533345.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mutosaraxekaja.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/nubixububewakutugexu.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16307383641611394097.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b3ac32995559ec486c90f598efc7b8dd/70936994519.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/96287545598.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikusexomir.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/69595227991.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/051728561057.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/wifavemefuwomuremisudola.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/lumobufezuzejol.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/79080783296.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60a729d65---bevafuvuzijiviwagisamavaj.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161340d93a5829---gobuguravomelizatutimoba.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/3775938223.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_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 17180 bytes
SHA-256: e4c48675b4d7ad2a3450612117b71c66cb784d85535550787dc61759034d68da
font_01_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 10604 bytes
SHA-256: dc9572a0e13583c449e037852e05c5c8f665ead1efa33a31fceb5d25a9153044
font_02_sfnt_off000134e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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