PDF malware analysis — malicious · a4a8c6ee53905ee9

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 14:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: da1f6f5c1ba079331b6c15d6ed62576d SHA-1: 90dd9b0dc523dce18df0e8086ec4c04f92a893c1 SHA-256: a4a8c6ee53905ee99ed84a4236059d0565d8b85d643f5ae204fa149d077b3c5c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to leverage these platforms for phishing or to distribute further malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate a broad, potentially automated campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=convert+350+f+to+c+fan+oven PDF link annotation
- http://kapelski.pl/userfiles/file/zofulosaf.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cd376f1b3---jixepazafepofatenebu.pdfIn PDF document text
- https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/5mtd5fi4eup5c962r021avkl18/3981220195.pdfIn PDF document text
- https://artenika.pl/fck/file/tajutajubadewiparuvigiza.pdfIn PDF document text
- http://cafemsoffice.com/userfiles/files/9827193241.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2724ba853---1626253388.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/e6183f544624983deff44b6e15c1c8a7/92644216564.pdfIn PDF document text
- http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3b033414---53577796152.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66be0785---fewolexob.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160883c178b572---76828317459.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f116be91---40278115544.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e9c4f77f---lazosuzifagubobozoxig.pdfIn PDF document text
- https://genegurumiraclehealer.com/userfiles/file/semunuzebamiraku.pdfIn PDF document text
- http://vencedor.coop/images/admin/file/wugimuxigogaginibir.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160943d2cc935a---voremasakemekobed.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098c667734d5---20010781296.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd49e610f---92140571985.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2d34238b3fd19f2fabffb09cba2716fd/11211178295.pdfIn PDF document text
- http://studio-castiglioni.com/userfiles/files/melovoxuwa.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/kanezenonida.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cebb3c24473---53264576861.pdfIn PDF document text
- https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bkp5ml2mt03mssteljhcuvjn22/17261641229.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/21bea40ebca5ad791c164ce50c4839b3/27131985505.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b00ca705807f9f5d8073a7e71b0251db/34262936582.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_off0000e91d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE91D	10548 bytes
SHA-256: `6f4c32add9604067053d4d6938fbf9e04723baf68b09ef050b91df4a36183ede`
`font_01_sfnt_off00010164.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10164	18024 bytes
SHA-256: `145e177739ee98538c9b49b1339174e917957e03ccdbe0bdfbb09e2a645d0b81`
`font_02_sfnt_off000130f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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