Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86ecbf9bad7b07c…

MALICIOUS

PDF

62.2 KB Created: 2021-09-26 07:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5cfc0cb959bb46190967b3c12aaedfff SHA-1: 7278a4cd0112be272f4ad28fda5d250b9babd935 SHA-256: b86ecbf9bad7b07c3ef6595e2ca92f82afd18c1603dffaca082fd552557f4d87
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and exhibits high-risk heuristics related to random and compromised CMS upload links. The embedded JavaScript stream likely facilitates the download and execution of a secondary payload, while the numerous external links suggest a phishing or credential harvesting attempt. The file's structure and URL patterns are consistent with common malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wonwon.taipei/photo/file/69878845266.pdf In PDF document text
    • http://stroyindustry.com/userfiles/file/55106004233.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/24115151673.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614500695d2fe---luwufigitekafinabanevi.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/37820576021.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/wikulerowiwiwobazunenimas.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1a72bef8c3a8d055fb28c8b656bfb116/31169689000.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/kodetefodis.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/90337594139.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/xawifotoreg.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/40341238853.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/l4rh5ogobore5f5okrmg1l8b6c/69609166371.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/55124845328.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a3955c7f24b6b387612edcbd297d401a/taxeton.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/91084479786.pdfIn PDF document text
    • http://computerdoki.hu/user/file/punezesunawakovigedojej.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138ada1c00ac---67209125463.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/pilomikujavubomululeda.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xegeginikotilisawubiside.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/luneniladiwozulo.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/pujuguwejunefezokuzabek.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/vuvuvul.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210926083618.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/boranapokixos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=windows+7+print+to+pdf+missingPDF 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_off0000b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 10632 bytes
SHA-256: 2dab175ae5e7cef26342a1adab45d611f6516b37297c28c383989af7a53d2ef6
font_01_sfnt_off0000cbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1