Malicious PDF — malware analysis report

Static analysis result for SHA-256 feff9661d0b29104…

MALICIOUS

PDF

87.8 KB Created: 2021-08-11 14:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c469d43b9d1bbd96dd84e478d614253 SHA-1: d9ae86e6540117c9cc152e97dee0f488003ba213 SHA-256: feff9661d0b291046dc055faeadb07cedc2ea6fd644d0e43b1864564979aec0d
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised WordPress installations. This pattern suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://skolicka.eu/foto/images/file/41408736018.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lvc0i216uskohebj07n42b57vj/toveluzovexaropeju.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/31670095235.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160877aa4aa41f---81652322382.pdfPDF link annotation
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd7bedaf0---84469648548.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/bodiborupugidevepox.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/pamugogazeduzipazaluf.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/14287691714.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/80431201166.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9178dc9ea---12657537970.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/bifikotob.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vhhorurhpu5m1o8en3lqiucdbl/64534181506.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6b3a7592---mavajalewekerobozobex.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/24022110944.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/26134242569.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gisatexuzanevep.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/kawigopusimugexuli.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf91565806---77895365159.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224759680933.pdfIn PDF document text
    • http://aven.su/userfiles/file/29936470143.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-21/20210721175704482831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=essay+linking+words+exercisesPDF 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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 10824 bytes
SHA-256: 2c7927ffaff7cc04b15de7da9e8a0952741e09c4c96f53d79545e71b5803b0c1
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 17604 bytes
SHA-256: 23505cada29fa64bad1b03c1bdf2d1af65b905dfbb4f554a71dbb985f978fc85