PDF malware analysis — malicious · 72cf2a3ce6231715

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 07:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 687d4743baf9aef671de6afacd6e9bc2 SHA-1: 5933c0629cea79886b978a21bc7e99e018de3266 SHA-256: 72cf2a3ce62317151b4c5e7610fe53bb4d77dca43601f4d7c9dcac773a32eef4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lobasgglgpnpr3b3v993qgve6p/belipowugakerax.pdf In PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce776939858---7039011724.pdfIn PDF document text
- https://novamakine.com/upload/ckfinder/files/38609415714.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g5p0aik2o0n1c77tb7qu9odstr/91724071098.pdfIn PDF document text
- http://penzion-u-zamku.cz/files/file/gipefilizamobozuxoxoda.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a89dec62d449df5aa48147339960b5c3/dubisezowujupixewe.pdfIn PDF document text
- https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81a60928f45b7714856582c66940450/40119451264.pdfIn PDF document text
- https://licorne-hotel-restaurant.com/userfiles/file/sufemexavufebitoj.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f90c708f---dumepozeguref.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/deqcmf7fijvh84jphv80poink6/zirunavegag.pdfIn PDF document text
- http://darienhigh69.com/clients/866565/File/98483339713.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/cv8saa3mrakpl4lcuqbn9o7dpt/16032384600.pdfIn PDF document text
- https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qcdor8igdv1ni4jt5rr5ahe9b6/11493623708.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607926154e26c---20781097564.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad0d08708---6479622597.pdfIn PDF document text
- http://mnogonomerov.ru/uploads/file/jibibodomawuladokep.pdfIn PDF document text
- http://nowyhotelik.pl/userfiles/file/85044121651.pdfIn PDF document text
- http://accessiblevehicleservices.com/userfiles/file/nebifaziwituwev.pdfIn PDF document text
- http://alkanboya.com/files/file///73245961785.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c93279358---dafenatutumuk.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1aa0881c---kabusu.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c6138a5b---48349956923.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/wolomekofarosa.pdfIn PDF document text
- https://bouwservicewinthagen.nl/userfiles/image/file/22573337371.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b89b2f78.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/06e27991f25685219f13057d480cbba9/maxuzikepunixadumazuxob.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/6748278992.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+know+when+to+pull+carrotsPDF 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_off0000ed90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000105a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105A7	10648 bytes
SHA-256: `adfd718b50acad320a80b26f2189ef42e9bd46938ddd5ef88775b747d363a1d1`
`font_02_sfnt_off00011e0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E0A	16696 bytes
SHA-256: `ef532c06e51cfc99f0a65ae0d97b413912aff88472a6f69fe0d227fdf03ba88c`

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