PDF malware analysis — malicious · cde356232ce56e07

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 19:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4c5cf881c15004739f4b3a985d01db5d SHA-1: 242058315367cc158fe2ff412410ccf8202cf6c5 SHA-256: cde356232ce56e077605766e92a303a99cf2f2711d5b2ecabe69432decaad8a3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 https://smidgel.ru/uplcv?utm_term=iphone+xs+max+vs+galaxy+a71 PDF link annotation
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145ea81c996e---5398024845.pdfIn PDF document text
- http://naturpix.ch/cmsimages/file/19119686750.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/64j5dh7sre8oceugv0qcfom613/betejemukis.pdfIn PDF document text
- https://gres-k.cat/userfiles/file/kufizozumubofex.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/aad6b18b25c560a59970ccec6df277b5/gaganovasemite.pdfIn PDF document text
- http://tunesistudio.eu/userfiles/files/foredajafogujajofuzitola.pdfIn PDF document text
- https://flour.co.uk/ckfinder/userfiles/files/nunofovobugezujopo.pdfIn PDF document text
- http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec2ba5556---58075785083.pdfIn PDF document text
- https://amursvoidom.ru/media/files/mesagejisibazekojejivavi.pdfIn PDF document text
- https://www.hippocratio.gr/ckfinder/userfiles/files/mefajanirexoxuda.pdfIn PDF document text
- http://palcev.ru/userfiles/file/vimif.pdfIn PDF document text
- http://jogagongu.pl/userfiles/file/9343068151.pdfIn PDF document text
- https://dichvuhappyhouse.com/upload/files/93769607767.pdfIn PDF document text
- https://adproissy.emailingmanager.com/uploads/editor/file/13115162545.pdfIn PDF document text
- http://sswjeans.com/files/jigajet.pdfIn PDF document text
- https://apelhijau.com/contents/files/nevasudajudojuxetuveg.pdfIn PDF document text
- https://www.kindspring.org/inc/ckfinder/userfiles/files/10925343363.pdfIn PDF document text
- http://xn--elementy-zczne-kwb98g.pl/media/file/41403341257.pdfIn PDF document text
- http://ballarioarchitetti.eu/userfiles/files/14837378948.pdfIn PDF document text
- http://www.salpasafarit.fi/tiedostot/files/zikuvojo.pdfIn PDF document text
- http://printific.com/images/contentimages/files/20986547584.pdfIn PDF document text
- https://skillmapmagazine.com/ckfinder/userfiles/files/50767179830.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a86705f1f0906d00253912c3db52778e/wiwireg.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/u70cknp42nobb7siog4mqeqh71/8893849712.pdfIn PDF document text
- http://sherwoodonionfestival.com/ckfinder/userfiles/files/43407984999.pdfIn PDF document text
- 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_off0000e471.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE471	10744 bytes
SHA-256: `fe335cfb89de1e21c8e46da16485b3a8fceebc8dea5b9a09f86dd920f1fb5ae6`
`font_01_sfnt_off0000fd21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD21	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011533.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11533	20356 bytes
SHA-256: `984617dcb014af244abc52763b1afc6992f7bcb33dd3c6e9e97c19c2b6c313e0`

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