PDF malware analysis — malicious · 825d80c670bbcb5c

MALICIOUS

PDF

77.6 KB Created: 2021-06-25 22:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: cbe8a1ede35f162eb20f91175c7598dc SHA-1: 17c7860f03fe8ac1ee8372d431da0626006b737d SHA-256: 825d80c670bbcb5cdf140fa6e77ab2ca5b26b31a7ce109c6d4b5a333c2debca9

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, and the presence of multiple distinct hosts and disposable hosting patterns further supports this. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=supplementary+and+complementary+angles+worksheet+pdf PDF link annotation
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/305eddc615eba6681998bf9e7b5b0a5f/34888983448.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a5304dcc505c6566d837a31fb29fa1b0/faxidezevur.pdfIn PDF document text
- https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6k644n34otd421g1hil8ptvcad/28640289959.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160895a0abe5e0---nafatuxebukiv.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bae3cbb385b59987255d6c198b9087a0/bimibogifubukovesap.pdfIn PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/eb26da0d9792125651e948ad779ee692/pibax.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l6118dpq47o4gfu7m2ce93u834/vogojosiledalizubaseva.pdfIn PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a551ec86b5e---dodeweradexogakedo.pdfIn PDF document text
- http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/17429729865.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4a172745cdf0aa25d246142145939ac6/dejopuxusobenexasisivu.pdfIn PDF document text
- http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160705439464ad---33850052574.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834f127068e---wekuzapizorima.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a714a740776---99393987368.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093c926406e9---bakagugilifofusigatofolu.pdfIn PDF document text
- https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7ac90b3678ef5657fb43e3aaa7bd9398/75651312190.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/vone1hcrhh2ej09ftgqcp3jt8i/xavemojarujimizuxo.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfec0e11ea9---59976958687.pdfIn PDF document text
- http://atallmed.com/userfiles/files/70468458883.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc774bfd7---zapono.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4944eac1e1bcf9c46a1a27296718fb46/61975507143.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1c1377ed5a8802a8787d8c7eb020105e/solasulimemojevereg.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a4f5e0de9b7b94c74a5422f507c6240b/28018633450.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_off0000caed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAED	11444 bytes
SHA-256: `089bb74f9817e61bb2e83488388e85956635b8589eddc12d246a94bd28a2d5d6`
`font_01_sfnt_off0000e5a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A4	16500 bytes
SHA-256: `b74cbd51ef36618c9190e602d938d8cd0dc907d65f06396711f01a3dbbd83966`
`font_02_sfnt_off00011091.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11091	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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