Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe1b665147abd18…

MALICIOUS

PDF

76.2 KB Created: 2021-07-16 08:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74eada9464dc27e496f2ee9f57451403 SHA-1: 7a7a76c26c75bca007666a0a7fad9f5bc5d08479 SHA-256: bbe1b665147abd18413e9690a6d6cd6ba0ef863040e46d0642fa7ab8c55a6ced
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, some pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The file's structure and the presence of multiple external links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

Heuristics 5

  • 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.
  • 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 http://dentherapia.hu/files/file/timusowetozigazafewapikig.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9e3e94fac90154a0bee9a783e7d2ac0d/43993172251.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/hkiuhgkdquhf4jvp9f2i5cnebl/42942083521.pdfIn PDF document text
    • http://skupka23.ru/upload/m/94737124400.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/xunijazarajesujiso.pdfIn PDF document text
    • http://biosite.ru/images/news/file/75270763595.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d7c40ee9---rogebifokavexugarotemux.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/mititiwijutogiwowo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef44bbb4e7---83932158997.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/benufoxenulatixedewuvu.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jusanepijin.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7dd34736c---pelejaxasiburefosot.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3df1118c---weboba.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a49c6037c---16737845322.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/xugonasumebuk.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a349884961b---jajekedasewen.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4b4e09425c912a5f900207a0d6cdbe47/dusilamitomijarafa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8370c16e6c---79037585757.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211642e291---pukakelidipon.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/tugosivogitokapov.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/14556381520.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ecac15c17---pezufobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fortnite+on+android+tvPDF 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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 10072 bytes
SHA-256: cb204070a401a79bcece08f5d06459db22999a6e946e5c7babcc0343761bb3a7
font_01_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 17824 bytes
SHA-256: 0210901d90b21b0b7c795e8c8c6d2de88008aed94140ba65117efc8f93a490b4

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