PDF malware analysis — malicious · cbe7a20814b3127e

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 01:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 619a411cecaa18a773466d75fd1f3ec5 SHA-1: 5fe3a5c23950d89165d82dde0d35421551487100 SHA-256: cbe7a20814b3127eda9d2e3a35223f46979bec01803768868933b9f3f160916f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=women%27s+working+conditions+during+the+industrial+revolution PDF link annotation
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/11cebc02d5791a61acc68a43ea7457b7/sokot.pdfIn PDF document text
- http://chekeeh.ir/basefile/chekeehir/files/41797375348.pdfIn PDF document text
- https://linardi.ru/files/file/zekipisek.pdfIn PDF document text
- http://cnwt.mgo.cool/upfile/files/2021/09/01/49631765565.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5fd42f26c---tibug.pdfIn PDF document text
- http://vekosgroup.ru/userfiles/file/jafivipamozirugiwi.pdfIn PDF document text
- https://thehouseproduction.net/file/tuwisusedaxelasugorudukur.pdfIn PDF document text
- http://chukguwang.com/files/fckeditor/file/baruwitonapotegozuwo.pdfIn PDF document text
- https://pointvirgule.ca/upload/editor/file/86696198125.pdfIn PDF document text
- http://www.vinoplaza.nl/img/upload/files/98996210929.pdfIn PDF document text
- http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/17330676019.pdfIn PDF document text
- http://longchimvac.net/app/webroot/uploads/files/33197795766.pdfIn PDF document text
- http://bharatandcompany.in/ckfinder/userfiles/files/zejiguzusife.pdfIn PDF document text
- http://pfmconsulting.org/survey/userfiles/files/wonejake.pdfIn PDF document text
- http://cobmedia.hu/include/36216832698.pdfIn PDF document text
- http://holidayservicemarsala.it/userfiles/files/48685305598.pdfIn PDF document text
- http://anael.fr/fckeditor/userfiles/file/foxerivakobenaruxenutuvam.pdfIn PDF document text
- https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/81047f04c33dac4cb50d0163acef8c06/12379853994.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_off0000ae13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE13	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c62a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC62A	11188 bytes
SHA-256: `c6899176524768b4a92647e9a17132c405187acf5d78c4e62475a2a4b2bc9b63`
`font_02_sfnt_off0000e013.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE013	17468 bytes
SHA-256: `4ba90bf3ab5f51af25bc6904bf15fd0ae2b4e138caca34a7194b2ef1836f3442`

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