PDF malware analysis — malicious · 21b3ed433d51e021

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 00:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 9c0e9d7ccdd6800ebd5b1e9515460fa8 SHA-1: b7bb2ac7202e205e44212dd6ce1f1c66ee8226aa SHA-256: 21b3ed433d51e02149ac8772d39334b277b30c4fdcb7c2b3823e03e82423e9c3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on a compromised WordPress site, with numerous links pointing to other PDF files. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious or phishing content, likely delivered via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16087f91fb6228---famebisaxu.pdf In PDF document text
- http://findingthegrey.com/userfiles/file/86741158018.pdfIn PDF document text
- https://1877painters.com/FCKeditor/file/fafej.pdfIn PDF document text
- http://alliance-ltd.com/userfiles/samojarukojukamepadenadij.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cffc7690f---13513389648.pdfIn PDF document text
- http://aklond.com/UploadFilesfile///2021051020471379.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ro4canm97npqbq00jq1j9uv0v3/kodolexuzi.pdfIn PDF document text
- http://fernandopelosini.it/userfiles/files/85628994093.pdfIn PDF document text
- https://contabil-fiscal.ro/mm/file/mifojevenoxisivagemutor.pdfIn PDF document text
- https://rotterdampools.com/contents//files/kofepokipazes.pdfIn PDF document text
- http://pc-driver.ru/userfiles/files/7162681846.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tisg69gd10vt1q264vltfq5572/59187157615.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rbjto69te3njic0s6lpeat4e9t/5800689787.pdfIn PDF document text
- http://phanvienphianam.com/uploads/userfiles/file/90122468760.pdfIn PDF document text
- http://thaiboxes.com/piceditor/file/58658243579.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4e90b4dc---donefevutajepakuvubika.pdfIn PDF document text
- http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/39626872450.pdfIn PDF document text
- http://pyroglobal.sk/app/webroot/files/userfiles/files/lipefiropelugobeduzubir.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gsj02nfvaurcev829gjb01prv3/3092818949.pdfIn PDF document text
- http://i-harmonics.com/upload/files/laxedow.pdfIn PDF document text
- http://beachhigh65.com/clients/879402/File/47359917328.pdfIn PDF document text
- http://xn--szabowski-tub.pl/userfiles/file/jakoredefuza.pdfIn PDF document text
- http://acm-medicali.it/userfiles/files/jogul.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/pivanatedoraguxaxaxoxelu.pdfIn PDF document text
- https://sikanderajam.com/Robinson/ckfinder/userfiles/files/tinijejofijan.pdfIn PDF document text
- http://farmina.ru/uploads/files/77786163761.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nepali+unicode+keyboard+layout+pdfPDF 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_off0000d4c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4C9	20896 bytes
SHA-256: `dbbf013b92e387fbd3f97121527bd7335541941c41fdfae9855ec36abf6b8ae8`
`font_01_sfnt_off00010bda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BDA	10868 bytes
SHA-256: `a82c4d4ca3428fddd73bb3743e8587ef4a184ef890f617cc48b6ba8347971919`
`font_02_sfnt_off000124e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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