PDF malware analysis — malicious · 5cebe68b21132f5f

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 09:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 71d839f5adbd7a04036b4652ab7de9cf SHA-1: 857479dfa5d6b191fe6ae7a76b8e5d5b43b14ca5 SHA-256: 5cebe68b21132f5f430bfbfb12c574645f9b8a4e0cefb54c1a222b5023e28014

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead the user to malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://safeabortionnepal.com/userfiles/file/newofujavejegudisivov.pdf In PDF document text
- http://danieldesignpro.com/userfiles/36518606657.pdfIn PDF document text
- http://keitbg.com/images/files/vosofasolunilusinewa.pdfIn PDF document text
- https://muacash.com/webroot/img/files/3531991126.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3c6ab3f3d4a1299e0ed508cc449fe031/72246651292.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1748ea69---wazonesuneledew.pdfIn PDF document text
- http://sk4education.com/ckfinder/userfiles/files/2021489031.pdfIn PDF document text
- https://planet-for-events.de/userfiles/file/91812703047.pdfIn PDF document text
- http://fly.no1-yes.com/userfiles/file/vudofotetawosike.pdfIn PDF document text
- http://lammermoor.net/imagenes/file/zolenaninunowefalur.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862eb45ad30---53419274551.pdfIn PDF document text
- https://playerpress.com/ckfinder/userfiles/files/73097317178.pdfIn PDF document text
- http://peaceinsrilanka.lk/userfiles/file/97480674625.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1c6186536---pibugiliwajunuwib.pdfIn PDF document text
- http://a-mega.ua/images/uploads/file/62476640519.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f53cbff98e3f0504f81c557e394704d5/mekimenu.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/77cee2505d3a86c5bef64d8f43a2b9b7/26179839732.pdfIn PDF document text
- http://beateromer.com/bilder/file/bejikikisivepivovijimibup.pdfIn PDF document text
- http://mobiliteit.nu/files/83154729375.pdfIn PDF document text
- http://www.aluvascientific.com/UserFiles/file/33877345919.pdfIn PDF document text
- http://verynailscm.com/user_img/file/81416884122.pdfIn PDF document text
- http://sportsclinicwest.ie/media/contents/file/vuzegebonit.pdfIn PDF document text
- http://regimhotelierbucuresti.com/images/userfiles/30146048562.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/812ff152b97a2cfb3430bf5a5c5d6688/28752169217.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=potentiometer+pdf+datasheetPDF link annotation
- 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_off0000bbaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBAA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d3c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3C1	10720 bytes
SHA-256: `2211e4d734d6795459d39f2e9fa321533373bfb041a8c0f3cc74f42c4d456bef`
`font_02_sfnt_off0000ec25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC25	16308 bytes
SHA-256: `f86b60e5d9d518052efa8ae9e8bc6de41062d5f2b7ed37f65db22b5cf66fca92`

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