Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7af9b1aa0288b95…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 10:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab04a7dcb728fdac703bf32454694c0f SHA-1: fa546b09de83f372cd4ae7c47010f95e30e07389 SHA-256: b7af9b1aa0288b959ad08bce1cf9ebf08de158901cbfac052ace21e31da912ec
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. This suggests the document is designed to act as a link farm, likely to redirect users to phishing sites or download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084126344295---60739697554.pdf In PDF document text
    • https://sukienmiennam.com/userupload/files/liwusew.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/bufazilasa.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/17305144328.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/gitalozoxorikisitexuforok.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/pikikexiborisogaxefupemi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2826b6778cb4860dbafd80747bafd188/lepidekosofizixobabugar.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095dfa8ea7ac---mazibozofunegaf.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/99393271624.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/72515d66cfb13265452207b714928069/77155079698.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/41044544797.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/v00f7ftrg58ild8v339omvahg3/lizowukawunofuxigawira.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kubuxataj.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/basunada.pdfIn PDF document text
    • https://ksboutlet.com/file/files/85688634256.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0624ea97a---2922364209.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9dfbfe54f2e35d405bd3df84982eff9d/tamixavazexafozejut.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/bejefozopufanokofuloka.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/79901790658.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ec48603c14194645a3bc5f10e25f4545/63575979726.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc078aaae---xevatesarorofexir.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/ripafavexapaterosotekita.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/7448193070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=marathon+diet+plan+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 10420 bytes
SHA-256: 5a5aad214b88c08f1f3b644e034d3493728fb31a8bec4f8f7f9f3433275870c4

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