PDF malware analysis — malicious · b5475956a9324d59

MALICIOUS

PDF

90.0 KB Created: 2021-09-16 04:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 9afc810b585a8470903afc338cee3a8c SHA-1: a8358e584581196a51d048c6140f9e93abf5640d SHA-256: b5475956a9324d59fe246b65d849c92a0aefe70463e941c57e445b493424f046

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

Heuristics 7

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.
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://krisoc.ru/uplcv?utm_term=chaar+sahibzaade+2+full+movie+download+in+punjabi+480p PDF link annotation
- https://inijariku.com/ckfinder/userfiles/files/43709909767.pdfIn PDF document text
- https://patoman.ro/ckfinder/userfiles/files/5027407873.pdfIn PDF document text
- https://stancijanegrin.com/UserFiles/files/xonafogipinagutirovem.pdfIn PDF document text
- http://nfrostov.ru/upload/files/xawevinuvo.pdfIn PDF document text
- http://lamelove-zakryti.cz/userfiles/file/8477445151.pdfIn PDF document text
- http://affectif.ro/data/Image/file/zutibuzizoxud.pdfIn PDF document text
- https://mimpisiluman.com/contents/files/95148544847.pdfIn PDF document text
- https://norservis.cz/files/files/94249676823.pdfIn PDF document text
- https://kaptenhoki.info/contents/files/84966320399.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb99ee0398---daxuwezigixekepulukexuzu.pdfIn PDF document text
- http://knuhpharm.kr/userfiles/file/20210911233128.pdfIn PDF document text
- http://caycanhtuyhien.com/uploads/image/files/digukoxipubururorogedigo.pdfIn PDF document text
- http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/30650865589.pdfIn PDF document text
- http://www.jacenter.org/js/ckfinder/userfiles/files/33536844581.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f788593046---bedezuvirimizezelaturo.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614296fc574df---maxananaraz.pdfIn PDF document text
- http://mp-journal.com/media/file/62157503705.pdfIn PDF document text
- http://novehorizonty.sk/userfiles/file/vulikiraz.pdfIn PDF document text
- https://kingdom.vn/userfiles/file/lasamoruwoxufexedoxevu.pdfIn PDF document text
- https://wrd13.com/force/file/55882147781.pdfIn PDF document text
- https://silverlabpupsforsale.com/userfiles/files/36173417610.pdfIn PDF document text
- http://akademia-jedenastka.pl/zdjecia/fck/file/97320131127.pdfIn PDF document text
- http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/kejevu.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136539f104fb---kenalowusojobozawemefifi.pdfIn PDF document text
- http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepewodomanaledu.pdfIn PDF document text
- http://npi-management.com/ressource/site-image/files/69084049392.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_off0000f737.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF737	11808 bytes
SHA-256: `d68fc34448098644231a9f9fb95c9aaf65dca4daec05c63760823395f58db578`
`font_01_sfnt_off00011328.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11328	17816 bytes
SHA-256: `aff9d39db1905d6212c65c0ca1165d2b0b9ed1423069f70225d507e701e70fb4`
`font_02_sfnt_off00014177.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14177	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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