Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8434b1b979c40e1…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 00:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04f6aedc2fcf0b4b103a8437285977ab SHA-1: fd4fc7b35ec3af8a123b59ce21567d4600f14239 SHA-256: e8434b1b979c40e1b4571ff108a1abcc2cbfa7d38c995eebba2f98c0437ad9e7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised CMS installations. This structure suggests the document is designed to act as a link farm, potentially leading users to phishing sites or facilitating the download of further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3776

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://ketchas.ru/uplcv?utm_term=easy+brownies+with+cocoa+powder PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0b42ad78---vovaloxejawipijesegu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/92dc3e79e567f3acf4e15b79e584c3ad/wudawosazef.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c12fa8911c5---72147248711.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/26774413342.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789772a1e59---94439899025.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074277b46236---16361763537.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad97d50c36---gejaribapenamifunewika.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079564ca279f---50967321806.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/85814105223.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/96782168490.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b829c1b81---zalizufofulapad.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2872e13804669e4ec70107461acf303c/sozefotufikagapidodo.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cdb451c8858c6910ad312b202536d3ff/topixamudelofogogodefunub.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/45824539051.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9dbc8a53093e5ec1d152a3683bcb6fad/16904397891.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/32665677102.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/0f07132a45c56a776c01bfc83ca1d857/73124725161.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/82228a4bdb4e89c6769a976c56a00fd1/nupixikuzomakixotezolorap.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///zudujuwebiloxap.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/pilelonujodalob.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/d554d79501658c241f67d8ef0af01ff8/84559757320.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/14003536520eef69d981eb888d0b6921/mudijudurudosofodasu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45b1fe71db---tesitogifilax.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ac663113082---57753106461.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/67586829445.pdfIn PDF document text
    • 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_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 10888 bytes
SHA-256: c66d2b125cd2c55b018bc8999f70568f8c5ee220bcbe377da0c49e0e4e927d45
font_01_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 18700 bytes
SHA-256: 6ec2aa8cf353dd0521783244b5c62eecc95e0f43ef1ae7500ebe9f704c953de5

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