PDF malware analysis — malicious · d87e8b3f5b3ab3d4

MALICIOUS

PDF

91.2 KB Created: 2021-08-07 01:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4bfa9b317b9e8dedbc157a5af2116e47 SHA-1: d34feda36687529195f8c9437168b169422ebe5f SHA-256: d87e8b3f5b3ab3d4aa4f27c8c17878a8edb2ada7d55358c3c909391ebbaf7c9f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the heuristics identify it as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted elsewhere.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f2cfa93eb0ab63ee00ea4b445b87cd11/45873806475.pdf In PDF document text
- https://egokituz.org/files/galeria/files/moxom.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984bbf237fd---65116961869.pdfIn PDF document text
- http://ocean-ex.com/images/blog//file/79551867768.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/22193424182.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdf7e91c3---26815884143.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac116851fa1---bamipusiguwoni.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba30dbc7b---lisosagetegukibisonomute.pdfIn PDF document text
- http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/mikijapil.pdfIn PDF document text
- http://ellenia3.eu/userfiles/files/50366499388.pdfIn PDF document text
- http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/61242657801.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/3ngd49gg21jcpo37j06c81j6km/28871446311.pdfIn PDF document text
- http://lavalnerina.it/userfiles/file/dakunur.pdfIn PDF document text
- http://studiorampinelli.com/file/pitigaropekube.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/tefipekuranega.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8da98435---408920195.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ceb3c076bccf42b4492040a68752abd/bisoketisagobisufabef.pdfIn PDF document text
- http://daehwa.info/uploaded/file/78146381753.pdfIn PDF document text
- http://strahovka66.ru/userfiles/file/7064641282.pdfIn PDF document text
- http://mabifitness.it/userfiles/files/76533582711.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/65190127933.pdfIn PDF document text
- http://orhs89reunion.com/clients/77823/File/zugosijepuwavigalefum.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2941197240---kukikuv.pdfIn PDF document text
- https://vanrun-it.nl/userfiles/files/18837265994.pdfIn PDF document text
- http://aaz.sk/editor_uploads/files/31920069183.pdfIn PDF document text
- http://www.naturhalles.fr/fckeditor/userfiles/file/35926281371.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=why+is+my+astro+a20+mic+not+workingPDF 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_off0000fde0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDE0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000115f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115F7	11024 bytes
SHA-256: `8add3e838a6aff126dd6f71fc9a5d401151925bafd32dc4ffd797955c1332b92`
`font_02_sfnt_off00012f94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F94	17256 bytes
SHA-256: `f263e61f3a8d436cefa73d38948547c2d3d394429441a4160b2383dd0b17deee`

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