PDF malware analysis — malicious · 81e37c8b8b2156a6

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 11:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 072b01f42bc5f972b5a644861e9836a0 SHA-1: 720141188d8179ec671cf35fec595429d7768fc2 SHA-256: 81e37c8b8b2156a6bb95ef461358ac43c50ce9e46fcd28479a8b20690dd8f72a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to distribute or phish via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=download+warcraft+3+for+android PDF link annotation
- https://www.prshots.com/ckfinder/userfiles/files/satuvojapaxiwefek.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5324bfa5---ninaxonajugid.pdfIn PDF document text
- http://studiobaliva.eu/userfiles/files/23847931834.pdfIn PDF document text
- http://traiteurluc.com/userfiles/file/690715541.pdfIn PDF document text
- http://www.tramag.pl/upload/file/69753093492.pdfIn PDF document text
- http://giasudaihocsupham.com/Images_upload/files/xowunibawubirotef.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161326685dfd94---3044031256.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b76da6c50---puvologivusofoniwasi.pdfIn PDF document text
- http://mindentudor.hu/userfiles/file/42820128600.pdfIn PDF document text
- http://terwaarde.be/ckfinder/userfiles/files/77916642078.pdfIn PDF document text
- http://nutranghongngoc.com/media/ftp/file/3525621280.pdfIn PDF document text
- http://vonschickenconcord.com/uploads/files/60020349898.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/51507793301.pdfIn PDF document text
- https://ehbo-oostkapelle.nl/userfiles/file/89803348352.pdfIn PDF document text
- http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jawagokazirimixafara.pdfIn PDF document text
- https://shiprapublication.com/uniformkontakt/userfiles/image/files/gobimuforoku.pdfIn PDF document text
- https://cncunse.com/d/files/83985662953.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8744eb8df2af539dde41ebb79a7bf78f/refedepuzagag.pdfIn PDF document text
- http://tradotel-riviera.com/file/fuzesepijovu.pdfIn PDF document text
- https://alutat.com/data/file/durebegojapop.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2be0af1218c46f9b21f784f279ad9ec/26207005556.pdfIn PDF document text
- http://bestpokeya.com/uploads/files/welelumogeto.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e949688d8e---22576462488.pdfIn PDF document text
- http://konikanarrowfab.com/ckfinder/userfiles/files/33124230210.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_off0000b3de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3DE	10428 bytes
SHA-256: `2ede8fa89179047301ee9f03abb85d9056fba8e8c3c737f78f8c7318633a0b00`
`font_01_sfnt_off0000cbad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBAD	14516 bytes
SHA-256: `fabe3fbb86a553aafd796bed1d23f91d34a8c523acbae9dc683a94a7460f07b8`
`font_02_sfnt_off0000efe9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFE9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.