PDF malware analysis — malicious · f1c16a7b3172d35c

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 15:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9ee72071708a93b4a62bbe41f78ca919 SHA-1: 12add1bf4c2b167f968a1c03a9fc2adcf6f1172b SHA-256: f1c16a7b3172d35ca021fa8d46271317c1e91c3dc8eb1914f20ff2212eba756c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to other PDF documents, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. This suggests a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 5

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://thegioimaychaybo.com/app/webroot/uploads/files/93732383266.pdf In PDF document text
- http://vansuloi.com/uploads/userfiles/file/76438113290.pdfIn PDF document text
- http://jinanxintiandi.com/userfiles/files/lemerogelazuvuja.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16127f28e76d18---98673233459.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aaae928c2---45002365406.pdfIn PDF document text
- https://etonbio.com/newsLetters/images/file/45264884973.pdfIn PDF document text
- http://numere-mopede.ro/mm/file/71893119596.pdfIn PDF document text
- http://www.childofafrica.org/media/userfiles/file/tesujigono.pdfIn PDF document text
- http://mstreatmentadvances.com/userfiles/files/mejiminusumarabujujib.pdfIn PDF document text
- http://cravaluos.com/ckfinder/userfiles/files/76998106493.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8dca69f367490616210890ee00c46c17/43531486958.pdfIn PDF document text
- http://drironcat.com/images/file/renuwujuwafaro.pdfIn PDF document text
- http://augsburger-dartliga.de/uploads/file/vimotuseke.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad0705a9f---dubisuzosilogow.pdfIn PDF document text
- https://leanuslab.com/UserFiles/file/dozudi.pdfIn PDF document text
- https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/9plngn11uplf8o9aqf28og3205/63944702312.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/bgd6ti8adg6a7vdpldg374qt06/rajorevijidaxix.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/be8b66b7bd9e47bf7e820e5f07719d52/74952935318.pdfIn PDF document text
- http://frezerovka.by/images/fxeditor/file/89244781506.pdfIn PDF document text
- http://hbisan.com/userfiles/file/74535554000.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611481ea49946---xixiwogilebovusugeko.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3987209be---63621221850.pdfIn PDF document text
- https://astek-telem.fr/userfiles/file/zolotunolosajikirepuk.pdfIn PDF document text
- http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/75190479980.pdfIn PDF document text
- http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e620a3d9---13660375887.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/83752565957.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=todo+sobre+el+daltonismo+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_off0000e7db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7DB	10760 bytes
SHA-256: `c237be522348e2f8e498df70ed7565b0f054823148880b2b9fd9c58a94ba413b`
`font_01_sfnt_off00010054.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10054	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011866.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11866	18784 bytes
SHA-256: `87d6a1b423d1d53840059513f9d1658829f945a5fbb8b3667ed57d40fd530c0f`

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