PDF malware analysis — malicious · afc8151311334014

MALICIOUS

PDF

79.4 KB Created: 2021-07-04 07:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: edb74036eea485d3a143f9952cbdc901 SHA-1: 704beffecb329ca4581cc332f167687393a71d31 SHA-256: afc8151311334014b52fd4b9301f89473b6b147cbe68cf4ef5d7acde9ee1f7d3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary indicators are the numerous external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=lcm+of+70 PDF link annotation
- https://aftaplan.com/works/peepsparty/html/upload_files/file/dunan.pdfIn PDF document text
- http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c854cfb545d---dapidaz.pdfIn PDF document text
- https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hi3fmpcbm5lbdv61hrn55ak9a8/munagebujomolosipe.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc32491467---luxig.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8c65f451bb62983fc20b58d456457b44/34944802710.pdfIn PDF document text
- http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e8609098---74231944624.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d75953cd8b8fb1d474344579835429ec/70901655533.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a6084d2c558---46029019293.pdfIn PDF document text
- https://vannordenvastgoed.nl/userfiles/file/88745373097.pdfIn PDF document text
- https://nepalimodelagency.com/userfiles/file/29480620791.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d20f356a632eeebeb9f66b8b4bfa02ba/18911971011.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8d792ce5---42855472446.pdfIn PDF document text
- http://cablexconsulting.com/Upload/file/setifumusuwawurusiki.pdfIn PDF document text
- http://namngonviet.vn/user-/files/radenes.pdfIn PDF document text
- https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/26927c9c931ffe6cd04582239c07d0b8/44038616103.pdfIn PDF document text
- http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/7327921582.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfabb3d51d---90299286168.pdfIn PDF document text
- http://tanriovermensucat.com/uploads/genel/files/boxakex.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/gonuninovofalamilezamor.pdfIn PDF document text
- https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/2f5j7pq1cqtina0mb77lmmer6k/jutigalutanoresutixefer.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f85351bd19---tajizikigovufu.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9827176b41b9a039f61974c48ff6e1dd/65736939190.pdfIn PDF document text
- https://abeess.com/userfiles/file/40160071269.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/tosadoxaxodobu.pdfIn PDF document text
- http://inarchengineering.it/userfiles/files/lijinenavezogu.pdfIn PDF document text
- http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99f839bb5b---zavozozawugiforojek.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_off0000da16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA16	9724 bytes
SHA-256: `efcc7c54a3da54dd3bd16c6dfeb47c5974df72edad47980a651e45b67099b3a6`
`font_01_sfnt_off0000ef4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001075f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1075F	16132 bytes
SHA-256: `e21f7937ede8bf26cc390b606e01b796d22fee55fd586f260751f2221f9fabb8`

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