PDF malware analysis — malicious · 2e46bb3a4cf03cf5

MALICIOUS

PDF

98.1 KB Created: 2021-07-13 16:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: b430fbe3666b61f67d9992ecd3e3fe9e SHA-1: 52f2b919ae29a895262aff13ec10e089240b87c5 SHA-256: 2e46bb3a4cf03cf5f1dd6ec41477a96fa6dfa2229c4be538e97ab2c61b45d95b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external URLs suggest an attempt to redirect users to malicious content, potentially as part of a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9898

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://archism.ru/uplcv?utm_term=maths+class+9+questions+and+answers PDF link annotation
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a93456f2e---mozanunipijibanazefotunon.pdfIn PDF document text
- https://cncunse.com/d/files/dabifavadubodegosile.pdfIn PDF document text
- http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085838321487---98329048141.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab341702e---77463393297.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7cd8f4008---33610331641.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/vbft72edned1v4rsfv28h5dhnl/jamoru.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffba054349.pdfIn PDF document text
- http://ristoranteibucanieri.it/userfiles/files/85918660448.pdfIn PDF document text
- http://sadiqandsons.com/userfiles/files/8784731399.pdfIn PDF document text
- http://xn--49s538bo8ux8c.net/userfiles/file/rukunisiwujagajizavu.pdfIn PDF document text
- http://zatexpress.com//upload/userfiles/files/zozabigurer.pdfIn PDF document text
- http://3e-recycling.ru/app/webroot/filesfiles/44923998787.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/mixusexufege.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e997987879cc119be918235d584b161f/77808902303.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/palamalixujamulenazebiped.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/dikoji.pdfIn PDF document text
- http://hsound.ro/images/custom/file/xigexu.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd7e812---zemozor.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/zuratoxixijopusoboz.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9160aa4f33084fe9e4a08564e64bba78/92899120934.pdfIn PDF document text
- https://brod-plovdiv.com/images/43724286037.pdfIn PDF document text
- https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/800a74835cc5fab5ba6ddc23ec4340b5/rolujetul.pdfIn PDF document text
- http://sbsinternationalschool.org/sbsisnew/userfiles/file/tegegizoju.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000106c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106C9	10960 bytes
SHA-256: `07eebfb2747d45044831cccf3897520c4bb65e92bf34de9fecdb0681399b61cf`
`font_01_sfnt_off0001200c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1200C	16224 bytes
SHA-256: `da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7`
`font_02_sfnt_off000135b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135B1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014dc3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DC3	16564 bytes
SHA-256: `44193d89be98f2e341dc6486d8330a1e361438eaf85e30c68c35a792cdb16cbe`

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