PDF malware analysis — malicious · e51d7cdfb31f2b3c

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 06:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3b930ebb48bbbf63d6c9ce997556274f SHA-1: 5a3d2a88f49ca5775ee1a246c006fcc862ac4893 SHA-256: e51d7cdfb31f2b3cd8adf8b4b2b989dd43c2e1a2b42e174203ecf5cce3946b78

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and link farm indicate a lure to a potentially harmful external resource.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://koreabulk.net/userData/board/file/nuxulemafabubap.pdf In PDF document text
- https://borgopitti.it/userfiles/file/dakudasuxusopaz.pdfIn PDF document text
- http://cuanhuaabshanquoc.vn/files/726805961.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c1e1b0f7---kipijixenu.pdfIn PDF document text
- http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/48539013185.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fb491c5e---bifapuzadarafagusixo.pdfIn PDF document text
- https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/f9iumom4rkb2q097fqpaevap82/sukuxenazadiv.pdfIn PDF document text
- http://summithigh75.com/clients/867147/File/suposatametufagapatev.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d118335d---totuninulizopukafadevo.pdfIn PDF document text
- http://ecovn.vn/uploads/news_file/kajikasanawurogop.pdfIn PDF document text
- https://gospel-streams.com/asset/ckfinder/userfiles/files/41588626593.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd254b74362---90051396726.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/87121784539.pdfIn PDF document text
- http://churchtextile.com/userfiles/file/teraze.pdfIn PDF document text
- http://axwelindia.com/uploads/fexudopidipavixi.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081c01376717---6840482575.pdfIn PDF document text
- https://avigailpekelman.com/sites/default/files/file/8756867088.pdfIn PDF document text
- http://mcutech.net/files/pexokokuvuxikaze.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607863903ec51---19650354994.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98846f9c8---50451582741.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cfeac51a0cbbbb216b29ce31daad19db/lasibobakikusuwinetomu.pdfIn PDF document text
- http://www.frank-diagn.hu/userfiles/files/1484106710.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f9573d71af5687283ffc2ee517ec01a7/musubupararezaf.pdfIn PDF document text
- http://bmcnx.com/userfiles/file/tilinulojewuzosebuju.pdfIn PDF document text
- http://shopcode.ru/uploads/file/21844616838.pdfIn PDF document text
- https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c188a40c841---97556067522.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=spanish+classroom+objects+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_off0000caf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAF0	11232 bytes
SHA-256: `3308921002836efbb79b460607fa5da9c33221b90c9918f318b6a22257ccf94b`
`font_01_sfnt_off0000e4c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4C1	18060 bytes
SHA-256: `054dcc3770ee327b08e336c4b081e49852a16d4b8744e5ade04adf75b4c7dc84`
`font_02_sfnt_off000113cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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