PDF malware analysis — malicious · 538f7b7b07801ec7

MALICIOUS

PDF

87.6 KB Created: 2021-07-13 20:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: e2dce7e3a4cbbc0f46e009e47e4297e1 SHA-1: 6f4f3d39ac316770b37f01d63af3cbae6c534590 SHA-256: 538f7b7b07801ec7046abc365bb84cee0fe7ea5ea2e8fbebfabaf54e0066d7e9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations, suggesting a link farm or redirection scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content, likely for phishing or further malware delivery.

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://oniceh.ru/uplcv?utm_term=imagery+in+creative+writing PDF link annotation
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7b7c882b---48916824561.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t5ukkdd93r0dj8u23n8b23b1n5/duvisozesafuzes.pdfIn PDF document text
- http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077154ebf69e---lorosex.pdfIn PDF document text
- https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e0eabd95---modisirazu.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/dd168e44280daaeebb07ab9e20c6168b/kofose.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3797a5f87a140c5621846215cd9f1734/zelomexurotomatabevudunok.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b08f3033b---67776981380.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075db1db774c---wazuketivadupaw.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2b6f1cff1ffae2333cc25a6b395e3308/90325869729.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2038a6e2357b8b9f9752d63878cc125f/66714099498.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o7cbi1977oqbc9p5lgo3lon1s7/90824964064.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6e95593ff1ea5ce7743bb8e5eb73e2d5/10037444809.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4fd58326dcb446dbd4e3948312529d08/8219299188.pdfIn PDF document text
- http://busanpc1.com/upload/fckeditor/file/88631829480.pdfIn PDF document text
- http://geyikkimya.com/userfiles/upload/file/79709838229.pdfIn PDF document text
- http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/85026117874.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d663b7770f---49990720566.pdfIn PDF document text
- http://mellorymotors.ru/admin/ckfinder/userfiles/files/31084111149.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5251ecd3---42106975404.pdfIn PDF document text
- http://sushi-belovo.ru/files/mirenozeninuvumoro.pdfIn PDF document text
- http://benardoutlite.com/admin/fckeditor/fckdata/file/kogudijomepofujabawoz.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeac6659e9b---bugofilegebemejujo.pdfIn PDF document text
- https://feng-shuiworld.com/userfiles/file/8950070687.pdfIn PDF document text
- https://gruntbudowa.pl/files/file/noluxezenego.pdfIn PDF document text
- http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeg97vi2fv3bjiu3toffdoq3k2/27845694749.pdfIn PDF document text
- https://biocoils.com/img/file/3738931685.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_off0000f402.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF402	16828 bytes
SHA-256: `64e18853f3081ed68194cb679b2628ee4e5a92c3ddb16fccdc066cdac32976a5`
`font_01_sfnt_off00011fac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FAC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000137c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x137C3	10456 bytes
SHA-256: `257f0bbc5995f541b0054ab12f99ce71e6eb60c2415256e9a57faa72c0f9d4a7`

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