PDF malware analysis — malicious · e7c3dfecb656c453

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 16:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2e28294389064f212702c5ed1e8d5e05 SHA-1: 6829c374563dd084fa1ced7fbc5d970c96fe5f09 SHA-256: e7c3dfecb656c4534f6cbb709d7f28725778e8981ae44d2a8fb8b4886c7e3798

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised websites, many of which are hosted on disposable or suspicious domains. The file's structure suggests it's a link farm designed to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://ketchas.ru/uplcv?utm_term=how+to+insert+pdf+on+excel PDF link annotation
- https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fecd8b780---gikub.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084836b27cee---ridobebujabitoge.pdfIn PDF document text
- https://mamadona.ru/ckfinder/userfiles/files/98688887722.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b7d1dd69da2d7dec0a184db4c4e281e4/3928037917.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/kogosupevus.pdfIn PDF document text
- https://brs.jo/userfiles/files/15323095801.pdfIn PDF document text
- https://bursac.net/userfiles/file/56760851623.pdfIn PDF document text
- http://designbyjoseph.com/uploads/File/sexepizil.pdfIn PDF document text
- https://ngonluathan.vn/images/ckeditor/files/gerilafumavejefugemaru.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bfae5d50---noponekixiwulufujonuma.pdfIn PDF document text
- http://worldcar.jp/userfiles/files/2824498174.pdfIn PDF document text
- https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9afc559fb638ae99ceaa51eaef2ec7af/68671099652.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c8d518107---11970304519.pdfIn PDF document text
- https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f43b0c8fb7cbe3a40a78757495d92811/baxobupunufozabavobe.pdfIn PDF document text
- http://omegapizza.net/uploads/files/16675983854.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f41ab58d2---jubedoje.pdfIn PDF document text
- https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/retosarojaxub.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8ebbbbf899449fb577eaebb01e1d3d70/21350662066.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6be73fd18---4637807690.pdfIn PDF document text
- http://sherwoodonionfestival.com/ckfinder/userfiles/files/31389232931.pdfIn PDF document text
- http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63177989409.pdfIn PDF document text
- http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/37451866560.pdfIn PDF document text
- http://waltonjohnsonfamily.com/clients/870437/File/zusobebudowam.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16113404327f13---kefagiraxigesipabif.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_off0000d399.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD399	18064 bytes
SHA-256: `190a79f8ccb4a0fc39b224200d8bfd742a5ebb96f0627ee39f0860c52dcfe17a`
`font_01_sfnt_off000102ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102CA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011ae1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AE1	10628 bytes
SHA-256: `01b93b4a8b51e082b9adba2b0c57e542ccf202ce215057512eee9228c443078a`

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