PDF malware analysis — malicious · 3c72b58312dd4630

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 16:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 02937101c9783a34e0bb8afb0d7e80d1 SHA-1: 8928cbeb9107f2d99a110dd5fea63695a98d7671 SHA-256: 3c72b58312dd4630a2f77ccb9713dceb710d73c428e1950bcd2632b81fd6ef55

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious files. The embedded URL `https://krisoc.ru/uplcv?utm_term=adobe+acrobat+pdf+editor+for+windows+10` further supports the lure of downloading software, likely leading to malware execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=adobe+acrobat+pdf+editor+for+windows+10 PDF link annotation
- http://desushibar.com/userfiles/file/vatilejenogano.pdfIn PDF document text
- http://jun-travel.com/userfiles/file/rebodoximiju.pdfIn PDF document text
- http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/dudolonupulijanibemama.pdfIn PDF document text
- http://harchovyk.com/userfiles/file/43836238865.pdfIn PDF document text
- http://erfaspot.com/resimler/files/falirejin.pdfIn PDF document text
- https://asesoriagade.com/app/webroot/files/files/40601501370.pdfIn PDF document text
- https://adasms.fr/userfiles/file/38562683716.pdfIn PDF document text
- http://opusincertum.it/userfiles/files/41699555538.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d328b4df6---fedenuganokam.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2d4abb180da359cd73819e94ddeaf96d/61995710841.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768255aed45---40367642026.pdfIn PDF document text
- https://xistenze.com/files/files/86399978338.pdfIn PDF document text
- https://apartmani-mestrovic-krk.hr/files/wujuxobemufib.pdfIn PDF document text
- https://www.alugutader.fr/ckfinder/userfiles/files/rukakerapiroro.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fe776edf---89408522631.pdfIn PDF document text
- http://snypes.nl/img/customer//files/bolitarokijibesuremavi.pdfIn PDF document text
- https://observatoire-omic.org/documents/file/74348514436.pdfIn PDF document text
- https://listapp.in/ci/userfiles/files/53064709964.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d94833a47aac26584fee10e569409754/xaxogubekuwum.pdfIn PDF document text
- http://denledmpe.com/upload/files/xukurotevijagopikefisam.pdfIn PDF document text
- http://akvatoria.by/UserFiles/files/beweraxodada.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e69d6cc8---5170846722.pdfIn PDF document text
- http://ambulatorioveterinariomariani.it/userfiles/files/26237881581.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb9a1c7f22---6036251457.pdfIn PDF document text
- http://vencedor.coop/images/admin/file/98274274616.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_off0000f243.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF243	18532 bytes
SHA-256: `2038bb8e60f0028f8737c688087fcc662873040c12b0d2d2bc9a97706e92dcf9`
`font_01_sfnt_off000122c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013ad8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AD8	10948 bytes
SHA-256: `1f238487beaa6aebb194df33a4dbd8cb289c55aab22505c51df791f8286141d1`

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