PDF malware analysis — malicious · 4f39ff5570afd098

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 19:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f92a4f6e4aeda657681287ef8275c912 SHA-1: 99bcfa3701bfa53f9e944cf8374a7549592c7ced SHA-256: 4f39ff5570afd098818cc612390e2ff7b59fc7879bb121bdafb0a9a486f084df

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with many links pointing to compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=addition+and+subtraction+number+bonds+worksheets PDF link annotation
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607490f71872d---22996394417.pdfIn PDF document text
- http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/butoge.pdfIn PDF document text
- https://zevkotodoseme.com/upload/ckfinder/files/41708495459.pdfIn PDF document text
- http://emanuelarombiarchitetto.eu/userfiles/files/zameguredakobukimodubak.pdfIn PDF document text
- http://centronegozi.com/public/vatovotefatipi.pdfIn PDF document text
- http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/gifajema.pdfIn PDF document text
- https://menuiserie-sainte-anne.fr/userfiles/file/69720854733.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4abddc81b---15213700484.pdfIn PDF document text
- http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/3295962606.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/04427a20ba6cca9560972aa6914c7131/57386503822.pdfIn PDF document text
- http://blpest.com/UserFiles/file/dukigegigoderuvop.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afacef68698---93399127651.pdfIn PDF document text
- http://prinsart.ro/uploads/files/87737365028.pdfIn PDF document text
- http://chongthamnguoc.vn/img/files/29114456463.pdfIn PDF document text
- http://proclima-membranes.ru/userfiles/file/madozavupil.pdfIn PDF document text
- http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20efa44522---jeromatevuwolo.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab95860ac---ropevamugoxigasezab.pdfIn PDF document text
- http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/29861996215.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7a36c91c597c6017d568c99f082e7444/42756025131.pdfIn PDF document text
- http://clinicoral.com/img/userfiles/files/pewodazorozo.pdfIn PDF document text
- http://ed-web.cz/userfilesfile/nunofo.pdfIn PDF document text
- http://norilskgu.ru/userfiles/file/32347361171.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/juzozukekibetiwakadukus.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44fde10c3---godimaribizanuteno.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244b43324c---69827925398.pdfIn PDF document text
- https://dadrarad.ro/userfiles/file/90966836330.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_off0000c759.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC759	17096 bytes
SHA-256: `b17e03107b75e28b3ad36fd50983fbc590e60b42c8cf08b1c66df5ee420eb1d7`
`font_01_sfnt_off0000f2de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2DE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010af5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF5	10988 bytes
SHA-256: `9c0603f0d317ee4bacc7078e16d01ab3105c8bd95de58d0a34308818e7e7d3d7`

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