Malicious PDF — malware analysis report

Static analysis result for SHA-256 4371257ebf729bb9…

MALICIOUS

PDF

77.8 KB Created: 2021-07-30 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: daea7bd5e6a05872975e22679c1198c8 SHA-1: 72de3c86cf15bbb3f3942f2d0e1ad3c58d569ed2 SHA-256: 4371257ebf729bb98a04b90b1792456ad90272e58e65ca4fec92e85311e65231
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3885

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 https://amblamy.ee/upload/file/59979058875.pdf In PDF document text
    • http://forglass.sk/userfiles/file/batanegibexipek.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/he4i4pt5qcf0lain7fnfdk1ct2/42312957031.pdfIn PDF document text
    • https://bamor.org/userfiles/file/mofubozituzalujopapod.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6a42dd16c686c2acf50f5aef7256681e/1253540672.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621075673.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/42409108664.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622506552.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094164e4e242---latupomedobes.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/tijisejojobefibisifaw.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a3545e673004fdf490502c78c528ca75/27568374221.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210621111434.pdfIn PDF document text
    • https://ahha.az/userfiles/file/48798433413.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/af5c5669d403497a3b0a674deb469d9a/44543478118.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/82ths6k7bem8qcav86db4nf9p6/lupowamuvi.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/af7931622863a2ec8c6b164fdc1d294a/nesipe.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/93964118393.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/19238842687.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d051bf1699---baderinebobogugofopufon.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/93016221304.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/jowudifomotubafogasob.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804b5b8e1ae---20468457996.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e19b59118---vimiviv.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lfin6ps4vjll03u8n4uu12e964/59133918413.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/31043762898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=10.s%C4%B1n%C4%B1f+co%C4%9Frafya+1.%C3%BCnite+konu+%C3%B6zeti+2020PDF 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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 11600 bytes
SHA-256: 50a7a1a7b9247ec739f52425c29ce3d85b1ca6b1d0dc285e2215d74b53ae2443
font_01_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 18540 bytes
SHA-256: 84c95e015fbdbb53928d463460a326466667f76e9ee7e41b55bdc0e097f52014