PDF malware analysis — malicious · 956f468fcc2ff835

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 19:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7a7183d9049c6e46d308d083e6582de6 SHA-1: fa26ff5e858c782538994a3f58245bba87680486 SHA-256: 956f468fcc2ff83593fc91bd0628dd410ff89f94ffa378d6ff7afbb3f722f3da

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

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://infrive.ru/uplcv?utm_term=periodic+trends+in+atomic+radii PDF link annotation
- https://santehsevast.ru/userfiles/files/4976253638.pdfIn PDF document text
- http://inventory-acepipe.com/images/uploads/files/xabegotujen.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d14234d14---xusowowesuvogoxipa.pdfIn PDF document text
- http://fbrasil.com/userfiles/file///nemalelezor.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c8584e44a1732b6aeaf1a41508ed8613/59020569984.pdfIn PDF document text
- https://onutglen.com/caningest/images/file/vunuvojaw.pdfIn PDF document text
- http://mtjjt.com/2013/upload/article/files/210909094913887941mfdls.pdfIn PDF document text
- http://twtime.com/uploads/files/202109060229522707.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2e89711643cf551b929f04a2456b037c/2625147599.pdfIn PDF document text
- https://madspot.dk/ckfinder/userfiles/files/43791783010.pdfIn PDF document text
- http://hk-bbc.com/upload/file/solaforusubajuz.pdfIn PDF document text
- http://uitvaartverzorgingsindex.nl/images/uploads/15496910520.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136303d8d520---66968765247.pdfIn PDF document text
- http://utuin.net/files/fckeditor/file/papiminuti.pdfIn PDF document text
- http://distant-property.ru/fck_editor_files/files/87443190964.pdfIn PDF document text
- http://progetec.org/userfiles/files/87978223978.pdfIn PDF document text
- https://sunriseinnjasper.com/nbloom/fckuploads/file/dimavoz.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/woravibagefutosoxitazuj.pdfIn PDF document text
- https://zenit-npk.ru/files/file/43614681761.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee857cca---dakogetiwa.pdfIn PDF document text
- http://jia-longsofa.com/uploadpic/jialong151126/files/202109190251003776.pdfIn PDF document text
- http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/73569121817.pdfIn PDF document text
- http://jfe.hk/userfiles/xezemov.pdfIn PDF document text
- https://foodphotoshop.com/userfiles/files/duvekonibopebefagur.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_off0000b601.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB601	17908 bytes
SHA-256: `7384152878fdd5e8416f3bd4b910164d6ed1f96acb519443d6d222a333cc1d9b`
`font_01_sfnt_off0000e41b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE41B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fc32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC32	10488 bytes
SHA-256: `181c5ffa22418533da711d3787f5130b15daed0f2aca369a7ccdc633765568e7`

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