PDF malware analysis — malicious · 3243dab47de14c66

MALICIOUS

PDF

96.3 KB Created: 2021-07-30 08:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 18c187ddfd5286cb03a7396ead655a9c SHA-1: 3add164ecbf31c1156d37a802d5d0160487bd3c2 SHA-256: 3243dab47de14c660291c43294eedee484ce73b0f5eba0f9823d0aeeda369c08

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs pointing to various compromised websites, many of which host other PDF files. This behavior is indicative of a link farm, likely used for SEO poisoning or to distribute additional malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/17c6e8c1161956c77af7ac20e9450d06/vevuziwutevinulavi.pdf In PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2813ccf7---risosukuzugofejibawevar.pdfIn PDF document text
- http://studiofapas.it/userfiles/files/vuxagubo.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a3106ac61e39486c46b9fbce8394ec6a/sokekuf.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160702d3e72792---latifimenupasanugozidud.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8569433391f4a4151fc8eff26e42bf29/pokejifafufobuliropedo.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mj6b5uq1u2ot7f7p91djcoujkv/8192617962.pdfIn PDF document text
- https://eastmanllc.net/ckfinder/userfiles/files/87854965544.pdfIn PDF document text
- https://dudikom.pl/userfiles/file/kolalazogogavuneginola.pdfIn PDF document text
- https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/5879ec9bf3fe620f06b718003549e267/30948021043.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a74de46178d---9743589866.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec96929914---lijajapar.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8482a81215f54c5d0522800851424354/4221368117.pdfIn PDF document text
- https://micro-logic.ro/images/uploaded/file/pisanesusavitejusuvuwebo.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2976a3d1a25ce813cff45ce58c47cd03/galoluxobineduboja.pdfIn PDF document text
- https://infrastone.com/userfiles/files/56531087563.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22a497219---lolaterevuj.pdfIn PDF document text
- http://www.thaiboat.net/image/upload/File/kakifaxinaweje.pdfIn PDF document text
- http://e-photo.lv/ckfinder/userfiles/files/82599247794.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db39ad1c9434f91ae3140cdcdb15ce51/wanugixotexaxe.pdfIn PDF document text
- http://mywymc.com/userfiles/file/81532872698.pdfIn PDF document text
- http://assistance.uz/images/shared/file/josibamepuzasenokiz.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c754c69bda---toxofugugukejij.pdfIn PDF document text
- https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/82d3e1b414e0cdd97c1e5da271e2c183/negifalilugaxamufenova.pdfIn PDF document text
- https://www.pessin-location.fr/ckfinder/userfiles/files/17804941954.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+de+comprension+lectora+para+ni%C3%B1os+de+primer+gradoPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f867.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF867	16068 bytes
SHA-256: `6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d`
`font_01_sfnt_off00010d87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001259e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1259E	11176 bytes
SHA-256: `2fa3d97d2a5aa4091dca57f47d58c4b940ace0c4ec79f90ca1dfc7f6d92f797d`
`font_03_sfnt_off00013f3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F3A	18776 bytes
SHA-256: `8ef27ac08039d831864d5e9359a9c25c6be310a7465ea1cc07babc658b23e4f7`

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