PDF malware analysis — malicious · 26e4113dfde3c5e5

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 04:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: c594362822cee5f0111eac4a83044070 SHA-1: a5bcdcd586b3615b77dd327ed75ec14aa35d7bf8 SHA-256: 26e4113dfde3c5e56577ff3591eaf22ec3dd65bd3e6b7076eb28c94fabde659d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to domains identified as potentially compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to direct users to external sites. No scripts were extracted, but the structure and URL analysis point towards a malicious intent to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://strahovka66.ru/userfiles/file/45384236946.pdf In PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b260f21221c---59720892906.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/df1fcd825ead5bd9ca01bb576f83f15f/fadowewitevi.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oo8dqip9vlnugd9nhuqp6qq4a6/34923563273.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c850b9ac---jukizapurejusobi.pdfIn PDF document text
- http://alexanderkanevskyartistbiography.com/clientMedia/file/5836935739.pdfIn PDF document text
- http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160817a998ef5a---lipibenawisufonuzokazo.pdfIn PDF document text
- https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fb1f51u72g4uvc21lj17q4apq/19202265929.pdfIn PDF document text
- http://rlangkhan.com/upload/userfiles/files/sidoladirumara.pdfIn PDF document text
- http://www.lugashotel.com/data/editorfile/serepilikijule.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e6d2c5577d97512efcf10f5106825b2e/biwula.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/29f5c7865c5ac50ac63bae257a94c5c4/mazofuladikowege.pdfIn PDF document text
- https://supermagnum-bg.com/userfiles/file/subudowopufim.pdfIn PDF document text
- https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7629283d4a0e2dffb548fa18e90a3a04/12847959687.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/28110570896.pdfIn PDF document text
- http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd430f8c83a---2895104719.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4c565ca6d---nebivora.pdfIn PDF document text
- http://mutamobilya.com/images_upload/files/45732267401.pdfIn PDF document text
- http://hodinovysoused.cz/upload/file/xanigevuk.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7b0b5043c1dd56d0f6f7bc0943d12862/48873032355.pdfIn PDF document text
- https://taevlingar.se/images/pages/file/60722101945.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60bce1dcaa---noferewefo.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a56f917bc03cfc07b34268c96e59b497/95034647238.pdfIn PDF document text
- http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/nepenagufuposer.pdfIn PDF document text
- https://jdrum-music.com/uploads/ckfiles/files/sadevidemapej.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d12a696cbff8be71f0e5e51369f1ee89/dosaxu.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/2a32df65470883d5127aa4fac5f72058/ribejogafumufa.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=salmon+and+mac+and+cheesePDF 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_off0000efa1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFA1	10420 bytes
SHA-256: `2130d146844e23b4d1ec61e2eaf04a3dac4d189f7eed1deeb928b13dc0af60f6`
`font_01_sfnt_off000106f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106F6	17524 bytes
SHA-256: `4c3ab2de43fe20610fd338291d1bf0cbb90cc01b59ddcf6708716f5d123d25b2`
`font_02_sfnt_off00013446.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13446	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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