PDF malware analysis — malicious · c53db5457f9368e4

MALICIOUS

PDF

130.5 KB Created: 2021-08-15 20:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: acb4008281fd8f4028ed56dc1e138897 SHA-1: 5f40dc9ae9e4a8144a4e0e3fd8ba4af060f41af9 SHA-256: c53db5457f9368e4dec3c71c12b6d61c6a1635b0c574a3f5113082df8058c75b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9879

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://garglob.ru/uplcv?utm_term=compromisso+radicular+bilateral+l5-s3 PDF link annotation
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/943592ccfb2a0872202a1d66f9dcaa20/22428805172.pdfIn PDF document text
- http://cedule-plachty.cz/files/file/xazigogurejujufiniwesobu.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-5-22/20210522193339200108.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/fgnpmm2pq5pa7db3uq2l87gn37/54226811589.pdfIn PDF document text
- http://kursadowicz.pl/Upload/file/10693447595.pdfIn PDF document text
- https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ose3phgu5jvpl2o3l5p3l6f9pl/vuradagasuxita.pdfIn PDF document text
- http://przedszkolenisko.pl/userfiles/file/venatasatibomavejux.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a1765e4711aaa7359bc26742ac0bea97/96879559678.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae95977102a---58598827662.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/4277440126.pdfIn PDF document text
- http://industrialsupplies.pk/userfiles/files/zanubuzumunoxanaribis.pdfIn PDF document text
- https://wietsevoermans.nl/ckfinder/userfiles/files/46113522948.pdfIn PDF document text
- http://banghetretruc.com/media/ftp/file/zusexoxurofoniw.pdfIn PDF document text
- https://girilawfirm.com/content_files/files/93914849185.pdfIn PDF document text
- https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/vetinomeguwob.pdfIn PDF document text
- http://nfc-lampang.com/user_img/files/37899360106.pdfIn PDF document text
- http://magnumprint.ru/upload/files/mabatokojejudezi.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7bd55f1fa---5925956928.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/51f31a16974f0bbe9f3f758a6a49ba0d/nazawilop.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d4cf3edd8a81dba42bc718d9fd088126/famavuvufatadizo.pdfIn PDF document text
- http://cariboohose.com/userfiles/file/46635407923.pdfIn PDF document text
- https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1b25bbaf8---27925770289.pdfIn PDF document text
- http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/39c543b90ae995bd1cf8015d66e7c3f3/rekiwanujagugibab.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba3de70a0---jerategopak.pdfIn PDF document text
- http://bestbelly.org/content/files/files/31262951287.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_off000196e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x196E1	20812 bytes
SHA-256: `3d4a3ab5e1c88ca410f1c2d4265d49140f1c07a361c9fa360540f9cd6a3b9752`
`font_01_sfnt_off0001c8d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C8D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001e0e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E0E8	11184 bytes
SHA-256: `8d932f54693cca35de74d662bec00c96b0548aeb9f89ac836b6ef7620833ed85`

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