PDF malware analysis — malicious · 1d5a42f0edb2ad27

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 23:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: a790b6f9f819c3e12de8f15d2b94cd43 SHA-1: d5d20e2c0b2a45a8a194297ed54374d2225480bc SHA-256: 1d5a42f0edb2ad27f01fb74a6d7058260d9b332af7e5372d28060fc85ce6bd9c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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 https://infrive.ru/uplcv?utm_term=anything+but+typical+full+book+pdf PDF link annotation
- https://www.uflo.edu.ar/ckfinder/archivos/documentos/39710979928.pdfIn PDF document text
- http://inglewoodreunion.com/clients/68690/File/tegazoledukigirivafiwene.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c5bc445beed3da72c269da5ba4882cd5/lejume.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd61b68ff---98550729042.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cccbe571a2c1b3408c17d2d041dad700/folulowuzowix.pdfIn PDF document text
- http://nhasachnguyenvancu.com/Images_upload/files/16157105326.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a42dee9e9f---lemimariluvuwilinamoba.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4fed35ec4---3148288259.pdfIn PDF document text
- http://laulumaja.fi/ckfinder/userfiles/files/tokogipozixejoga.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610af93256f2d---92039864600.pdfIn PDF document text
- http://xn--80akoseq9f.xn--p1ai/userfiles/file/tupapuxojovet.pdfIn PDF document text
- http://twtqedu.com/userData/ebizro_board/file/nojipuwatojosex.pdfIn PDF document text
- http://harchovyk.com/userfiles/file/10019182107.pdfIn PDF document text
- http://krukewittfarms.com/userfiles/file/24600541203.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/83854560579.pdfIn PDF document text
- http://garderoba.sk/images/_file/kemugegatudurufox.pdfIn PDF document text
- http://thaiboxes.com/piceditor/file/dalesesimovoza.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/miwububorireju.pdfIn PDF document text
- http://globalquestconsulting.com/userfiles/files/tumubizibedixewujetufa.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5rh7llh4v4cvg7vlv5n85j8734/pojiwowoxisut.pdfIn PDF document text
- https://nnkcreations.com/userfiles/file/kagovuxagovunixiremukel.pdfIn PDF document text
- http://studiolaviano.it/userfiles/files/60788699268.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d131085524---27375903766.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l0fu20tgsv1brn7hro5bmhni0u/vibozepeferijubego.pdfIn PDF document text
- http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77134590859.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3f75cbc22---mewux.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_off0000c479.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC479	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC8B	16888 bytes
SHA-256: `7d8116312d30b31fe67268937145f4eb5a62b80e464ff592d9d7141a1c68c92d`
`font_02_sfnt_off0001077b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1077B	10924 bytes
SHA-256: `4a00ac042e75b7d6fd2bbae69de52f794f8aaa1a65199c78a507ca03d0c7fc1a`

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