PDF malware analysis — malicious · 927787bb1e119a1e

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 06:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5ad494108104b906c889e24595fc283b SHA-1: 6c94476ff73cbf72e5c66dc369dc30257ef48b49 SHA-256: 927787bb1e119a1eb95d0a6eb8b95de2fa45e863aee1c5803d47bc3992fe9aa8

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to phishing sites. The presence of multiple external URIs, some pointing to compromised CMS uploads and link farms, further suggests a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://fceresources.com/ckfinder/userfiles/files/728857010.pdf In PDF document text
- http://seyrimerdin.com/userfiles/file/kikavogawuzagefovepilaso.pdfIn PDF document text
- http://mtjjt.com/2013/upload/article/files/2109120935268898819f0u4.pdfIn PDF document text
- https://mtmnetwork.net/uploadEditor/files/42125001526.pdfIn PDF document text
- https://sukienmiennam.com/userupload/files/zizoreguxoriwepuf.pdfIn PDF document text
- http://www.tekkoo.net/images/library/File/59814870230.pdfIn PDF document text
- http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/55338064069.pdfIn PDF document text
- http://caigeshi.com/uploadfile/file/2021090620145973499.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/r9ib0km2gn9vut893rf1s4rjq7/pefazukapesudomiwurewu.pdfIn PDF document text
- https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/7456443537.pdfIn PDF document text
- http://sbcnepal.com/images/file/39993705434.pdfIn PDF document text
- http://cu-mbc.com/ckfinder/userfiles/files/mojevopezilile.pdfIn PDF document text
- http://keitbg.com/images/files/mivepirezewevetavi.pdfIn PDF document text
- http://omatsuri.kr/data/userfiles/files/97338971497.pdfIn PDF document text
- http://0851gay.org/userfiles/202109file/2021091811174270554.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37efbb35c---kiratunenaguginipivileni.pdfIn PDF document text
- https://matfreklam.com/calisma2/files/uploads/72039694881.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hi091hcudl2q1lga21iboihmq3/zulupebojerel.pdfIn PDF document text
- http://chandravanshi.com/userfiles/file/31071948598.pdfIn PDF document text
- http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33e8e8079---xudasazadulosimibuzabi.pdfIn PDF document text
- https://tradingphrases.com/userfiles/files/bakelerewinoludizi.pdfIn PDF document text
- http://tykhchem.com/upload/files/44200070614.pdfIn PDF document text
- http://lube-stc.com/ckfinder/userfiles/files/76746852039.pdfIn PDF document text
- https://ooo-kenk.ru/userfiles/file/gazujidopedof.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b3cce9b3c---68411863704.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=time+tracking+app+androidPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In 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_off0000e27b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE27B	10700 bytes
SHA-256: `171c88b73d0c3e1902c642a354a6ef0ed5b9c8ec249efe1b166cf6bbd796a0c2`
`font_01_sfnt_off0000fad0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAD0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000112e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112E2	17452 bytes
SHA-256: `38aa6fb6b70b4959ea77ee97962bcf7a8f15dd2b3983889fba98b8b8272fa039`

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