PDF malware analysis — malicious · dd61b545b2935926

MALICIOUS

PDF

89.0 KB Created: 2021-06-21 09:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 451214b61ed8a49ef6d8eacceb54b511 SHA-1: e301603ace180fcbadf7429516b1e56df8d4a4a2 SHA-256: dd61b545b29359262674dc6855a1545a4d8360efa5c849e14a2561153373e018

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

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

Machine Learning

Nyx PDF Classifier malicious score 0.9482

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 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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://shiinamotors.com/js/upload/files/40959204578.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf11671cad---buvuse.pdfIn PDF document text
- http://ansonseatery.com/uploads/files/zorupuwodezelu.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1557802ad3f59b5bc2bba08531ec9fe6/24172260760.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d6a81b7ff---92693068155.pdfIn PDF document text
- https://fa-vietnam.com/webroot/img/files/lajupilipasabuvupasubu.pdfIn PDF document text
- https://blagoustroystvo24.ru/ckfinder/userfiles/files/74745588417.pdfIn PDF document text
- http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b16e64882---88231516755.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m4u5tqlj5s44nt0a2p3ra5b30v/fusipodoxa.pdfIn PDF document text
- https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/10849093481.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/80d7c8f070f34a8b93fda3e47e8b5113/9696597331.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a05d2deb---62166957352.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4846bbcfc138559a96fa684a2e62ef24/zufujebaxopub.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/81b66e0198288feef79bc0ab07392287/duwelifidudupeziremuviw.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=train+to+busan+2+subtitle+in+englishPDF link annotation
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off000104c3.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x104C3	4072 bytes
SHA-256: `d66968e3a9718a9205abee3ccb5c34b7351258360db58cbd64581dbe3808484d`
`font_01_sfnt_off00011331.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11331	5168 bytes
SHA-256: `ab8f38a10e1868057f56a27a7e97acb316db12c36b9303d3057c6be9e687c5e6`
`font_02_sfnt_off000124bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124BB	11456 bytes
SHA-256: `a67b7d257df430e7a0ecc7d64cf0f9faf045f7ba9f4de4bc4cf4f75dcc2ea983`
`font_03_sfnt_off00014bd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BD7	16068 bytes
SHA-256: `3b1167557c0500c78008053c404847a906c4d495ef15adec583fc97e76626070`

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