PDF malware analysis — malicious · ecddb9ee21264300

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 04:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9551d28f31632fbfed8c3dc9a94a8bc8 SHA-1: 7a54b5161c15c6cb079ab3663a3190851d9a31be SHA-256: ecddb9ee21264300f326e5d7b293961a44053ef965719b26fe48f48950911f62

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains phishing content. The presence of numerous external URIs, many pointing to compromised CMS uploads and link farms on disposable hosting, suggests a phishing or malware distribution scheme. The primary goal appears to be redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=red+plus+purple+equals PDF link annotation
- http://bernardthevenet.fr/ckfinder/userfiles/files/savegudepopubusomawazu.pdfIn PDF document text
- http://sensitiva.fi/UserFiles/File/fameturuwabutobogi.pdfIn PDF document text
- http://nemdanangpho.com/uploads/2021-09-14/images/files/35712991359.pdfIn PDF document text
- http://highdeal.linkeo.net/ckfinder/userfiles/files/pedigojemewomuxegumunox.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5v0q3vq8ub7ho13hg7i32ub5q8/kiwaxulubipese.pdfIn PDF document text
- https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa36332c3b6e0404414d65cfa42cf1a5/loxawep.pdfIn PDF document text
- http://ugrctrani.it/userfiles/files/voravuban.pdfIn PDF document text
- http://tecs4.com/intranet/ckfinder/userfiles/files/mogalewiwomamipelu.pdfIn PDF document text
- https://reclamesticker.nl/images/uploads/file/In PDF document text
- http://td-mg.ru/uploads/files/lasopajederifupugok.pdfIn PDF document text
- https://gonguyenkhoi.vn/upload/files/malivuvujosomopizijosu.pdfIn PDF document text
- https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/23299959062.pdfIn PDF document text
- https://cooperspick.com/files/62325322908.pdfIn PDF document text
- https://khoahoc.timviec365.com/picturesfiles/53906170951.pdfIn PDF document text
- http://copingconversations.com/userfiles/file/84944317533.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/74476rh7ke4ud9hh6pilsl9dn9/60371879320.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/mutimododuj.pdfIn PDF document text
- http://sz-nuoyi.com/Upload/file/2021091204170615064.pdfIn PDF document text
- http://bannhuaduong.net/upload/files/moxuvoro.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/546ac9efaa26ae08c64bd4940fa7c33b/41731053092.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56312e459---gajilufesamarixeposuka.pdfIn PDF document text
- https://amursvoidom.ru/media/files/1158660394.pdfIn PDF document text
- https://atpl.aero/ckfinder/userfiles/files/kugubolagijipopaxigepefek.pdfIn PDF document text
- http://elezioni2014.gds.it/userfiles/file/66139890539.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_off0000e1f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1F3	10264 bytes
SHA-256: `4401b5847cf7c12c7050c0fddc86936035615b1d84eb071232a0b3e0e2c7bc32`
`font_01_sfnt_off0000f8e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8E8	18128 bytes
SHA-256: `ae403b2132a38c7605f5a558e3754ec75a8ef26c273ed4e6027939c3c0b23dcf`
`font_02_sfnt_off000126c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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