PDF malware analysis — malicious · 4ca1981fd6937efb

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c80887aa6cb4a7882c19f24b026cba82 SHA-1: 4da01c3731b52017439ffcb40e1069c597526c36 SHA-256: 4ca1981fd6937efbbaecb195200b4cd0a23f304e84ce58ebbf7c4cca4bf2dd2c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress uploads. The presence of external URIs and link farms suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.7145

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://inwebjor.ru/uplcv?utm_term=wolves+in+native+american+culture PDF link annotation
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610011bfd67c6---18389558795.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/31246155214.pdfIn PDF document text
- http://jfac.kr/ckfinder/userfiles/files/visuwaw.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf15872c5---kezotuwizurivuzuz.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vo89hq7v9lspql6avcbk7fjnnb/jamuvuparumitupon.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4693c40345---71626315827.pdfIn PDF document text
- https://perfecthospital.net/ckfinder/userfiles/files/87313765620.pdfIn PDF document text
- https://almuhja.com/ckfinder/userfiles/files/52417738913.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/kiropekukajomapurexizurit.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf662408e5---fatenuzijekiwujupajekowe.pdfIn PDF document text
- http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14058824814.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611e9591b593c---wakodewexumuwuro.pdfIn PDF document text
- https://ivanamihic.com//files/lasutef.pdfIn PDF document text
- http://fsanaq.com/upload/file/210801230325229752mtgiaeggpahb.pdfIn PDF document text
- http://urotunisia.com/uploads/FCK_files/file/84172543782.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3dvon9ndlqach4burargmcgj7k/xepeg.pdfIn PDF document text
- http://adance0112.com/upfile/editor/file/fupugojuxorolutirefe.pdfIn PDF document text
- http://kryotherapie.net/neu/userfiles/file/bafuramivibaju.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ojanc5t68c8qjdkh9p7e0ssqv1/kisawivi.pdfIn PDF document text
- https://audreyheselmans.com/_files/file/34217027536.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/ld3k7gbjv8lu6d5fafrdtpf0os/juxevuwisowipulidafotaj.pdfIn PDF document text
- http://poexali.org/static/image/_u/system/files/57242246657.pdfIn PDF document text
- http://dralituncer.net/userfiles/file/turigabo.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e45e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE45E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC70	16412 bytes
SHA-256: `d7389bd3f0d0f59980ee62a96b75a815cf6a752e32953c77a951e6ef6f06623a`
`font_02_sfnt_off00012661.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12661	10552 bytes
SHA-256: `c6bb2d9a6b00d066c299e1ea8ca1b81b988309be0252b78f6e8ca587e900bfbf`

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