PDF malware analysis — malicious · 7d38ce881b96bfa0

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 12:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 3a659f4f0e33c269fbd20588024a920b SHA-1: 23865b4674ad49e7e2a7087a33d97573b281558b SHA-256: 7d38ce881b96bfa0affad5610f9157ef106939b0d761405f33addc1283097609

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or malware distribution. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files disguised as legitimate documents.

Machine Learning

Nyx PDF Classifier malicious score 0.7965

Heuristics 5

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
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://infiniti.e-library.tw/uploads/files/60323379853.pdf In PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/54a9a4113a21698ee754c1ae5bb6ed44/75074011645.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead1e2dde8---5133782622.pdfIn PDF document text
- http://yokosohk.com/files/fckfiles/file/80558140655.pdfIn PDF document text
- https://bursakaynak.com/userfiles/file/47460920194.pdfIn PDF document text
- http://rimini-portal.de/bilderarchiv/file/97873787690.pdfIn PDF document text
- http://taikenplan.jp/ckfinder/userfiles/files/14491366920.pdfIn PDF document text
- http://goldenagegroup.vip/userfiles/file/65934757617.pdfIn PDF document text
- http://openendrep.com/userfiles/files/venuzix.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2b2ed5f1---gupuretojifojuj.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/849f3cd56aeba7d32982cc008fc7a142/getajo.pdfIn PDF document text
- http://kovovyroba-nosniky.cz/UserFiles/File/bebutanuforubimiturul.pdfIn PDF document text
- https://episcopiaoradiei.ro/files/43903491479.pdfIn PDF document text
- http://keralatravelpath.com/uploads/file/xofusanavejogulurotenoked.pdfIn PDF document text
- https://salonrewards.ca/images/file/79694391825.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd6e3d231---tubeniru.pdfIn PDF document text
- https://www.champagne-cornevin.fr/ckfinder/userfiles/files/63463659019.pdfIn PDF document text
- https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/4340951085.pdfIn PDF document text
- http://deccanquest.com/konadnew/userfiles/file/65051046908.pdfIn PDF document text
- http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1286882840.pdfIn PDF document text
- http://hexindechem.com/upload/files/5278918843.pdfIn PDF document text
- https://istocdukkan.com/userfiles/files/nisafumixuja.pdfIn PDF document text
- http://bushurov.ru/images/files/56126666961.pdfIn PDF document text
- https://strechybenesov.cz/content/33732402042.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shareit+app+download+play+storePDF link annotation
- 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_off0000da06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA06	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f21d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF21D	10764 bytes
SHA-256: `d48f6e5fdd0a3774388c56bf3d0231c860780c7af0bf8e10463b4f823fe411aa`
`font_02_sfnt_off00010ada.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ADA	16844 bytes
SHA-256: `43f8c404e43edc0c5baad92a6be405a7f2f2cc15a676f666fcd4b83019ce1faf`

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