PDF malware analysis — malicious · e1cbfc6da0a13ca4

MALICIOUS

PDF

76.3 KB Created: 2021-08-06 18:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 564ba758778dfae6961b39710726fc60 SHA-1: 9c00b72d39a6c457415122c7118aed769b6edb06 SHA-256: e1cbfc6da0a13ca46eb488db3d3738a3abd753269147a21d14b1e2fa915b7fc8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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=elephas+led+mini+video+projector+manual PDF link annotation
- http://longearedhounds.com/clients/65743/File/nezalija.pdfIn PDF document text
- http://abwjefferson.com/uploads/files/rufozavut.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4e187241e---16985584906.pdfIn PDF document text
- http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f771836bff---nusanob.pdfIn PDF document text
- https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1105cfc3f223f3f709fa5fed1604b49b/33048952369.pdfIn PDF document text
- https://giverny-bkk.com/upload/files/30732471668.pdfIn PDF document text
- http://lagostena.it/userfiles/files/97978074672.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5df4186744636c0fe805ba5a2e6fb374/sekib.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/717c9fc0b3b281be7e86b3ad0fa593d4/12330941761.pdfIn PDF document text
- https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca3a9b222---22928952317.pdfIn PDF document text
- http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f84d7518---marolijawimoxujezerev.pdfIn PDF document text
- http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8sc0s9injm9smreud2h3jgh343/73562632519.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ba621f359a8c5fba6fe2e9c3c1cbe570/98301473915.pdfIn PDF document text
- http://targhevaticane.it/userfiles/files/38472275545.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8fa5c1b2---gojorubebifazem.pdfIn PDF document text
- http://amoy-art.com/Upload/file/lojofolita.pdfIn PDF document text
- http://himalayakebab.com/shipinc/userfiles/files/89668056113.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/91e59bb174ca2c74cbc7128825ffdd0c/23041671954.pdfIn PDF document text
- http://anipetkingdom.com/webroot/img/files/fofasenoporoneju.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/39bd353c984c9476bddaea32cc8a2a89/2168544653.pdfIn PDF document text
- http://fredericjean.net/oplusco/file/97897310350.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/af9cf568040e666e82ad02152d95f04b/xanaduwasebokox.pdfIn PDF document text
- http://bjhtdszdh.com/v15/Upload/file/20217311620326412.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607758d3e2bd8---50757814536.pdfIn PDF document text
- https://mabuksusu.com/contents//files/tuzot.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_off0000c70f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC70F	11060 bytes
SHA-256: `0d16e2b2a40d5ff50abf3f72a7650a3f4313db549d0a7c51f711b5d17ac5af45`
`font_01_sfnt_off0000e097.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE097	16456 bytes
SHA-256: `b09b14a912ca2868459a8267f16a661fa48cc3ea88d13a9204a4080557b1985c`
`font_02_sfnt_off00010b2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B2E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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