PDF malware analysis — malicious · f5c17007a04620e4

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 10:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7f8df43668b4d965da31227fc157526c SHA-1: 372df5b6ccbec7243f215074699620ab413cfcfb SHA-256: f5c17007a04620e42d85a7dda26718e3ac6cde6b9857fe18256ab27e59d3dd47

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting sites and compromised CMS uploads, such as http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8fa94e5e4---8410873116.pdf. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 6

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
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 http://coumert.com/images/file/jenufa.pdf In PDF document text
- http://benedictinoselrosal.org/ckfinder/userfiles/files/57563926631.pdfIn PDF document text
- http://bjyhyy.cn/filespath/files/20210910091800.pdfIn PDF document text
- http://hani-bee.com/userfiles/files/25021485331.pdfIn PDF document text
- https://coastalholidayproperty.com/ckfinder/userfiles/files/87072242244.pdfIn PDF document text
- http://zhizhencn.com/filespath/files/20210904041402.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8fa94e5e4---8410873116.pdfIn PDF document text
- https://habibitours.org/ckfinder/userfiles/files/lofuvuva.pdfIn PDF document text
- http://ideviceplus.be/app/webroot/files/userfiles/files/luwezudazifobiz.pdfIn PDF document text
- http://somkuthyoptika.hu/editor_up/39485534556.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/fugiteniduxudi.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790efd3ee4---31937065612.pdfIn PDF document text
- https://luxm.pl/userfiles/file/dubuto.pdfIn PDF document text
- https://www.milestonesmn.org/ckfinder/userfiles/files/25362305581.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea95921a04e04e01136f8bc006380ea/guwuwatavufimorukameput.pdfIn PDF document text
- http://marketingnews.fr/images/file/xolowitetak.pdfIn PDF document text
- http://cmtsport.com/pliki/99317384005.pdfIn PDF document text
- https://chulintemple.house-well.com/CKEdit/upload/files/rubofuxamokijazamosuloze.pdfIn PDF document text
- https://noithatkuongthinh.com/uploads/files/53724515947.pdfIn PDF document text
- http://sherwoodchambergolf.com/ckfinder/userfiles/files/kefigubipadebama.pdfIn PDF document text
- http://alltimescare.com/attachment/files/sanafefi.pdfIn PDF document text
- http://canadapremiumlubes.com/survey/userfiles/files/23612263054.pdfIn PDF document text
- https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0b1ba2db---52257232692.pdfIn PDF document text
- https://xn--80ag1a2a.xn--p1ai/files/file/lagisipodafedun.pdfIn PDF document text
- http://starma.pl/files/file/gewunasug.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=7+letter+h+wordsPDF 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_off0000c804.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC804	10028 bytes
SHA-256: `10514c2b713fef484a6600231109e56b0f9dbddbcd6a6b2ee51e10eb19f4fe99`
`font_01_sfnt_off0000de88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE88	18476 bytes
SHA-256: `727aa9c203d2c945e9792f0dd132c1bdce6222f8f606afd9c1c9682a18fb3c6e`
`font_02_sfnt_off00010d73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D73	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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