PDF malware analysis — malicious · 883f89f1f9281e49

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 04:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 01dae551a159a5bf02deb37cec9a8c8c SHA-1: d52d468cc0f4e6672362a6d3bf8d36543cd8b788 SHA-256: 883f89f1f9281e49cb3d71687844e30ce691513419a65b0eb245eb0eb3e5a09b

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 embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern observed is the use of a PDF document as a lure to drive traffic to external, potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://cructi.ru/uplcv?utm_term=ntse+class+10+previous+year+papers+pdf PDF link annotation
- https://abe-rdc.com/userfiles/file/65568335885.pdfIn PDF document text
- https://emilline.dk/ckfinder/userfiles/files/bazege.pdfIn PDF document text
- https://audit-advisers.com/userfiles/file/xipifajapibadura.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd3866a00---potajuzipesos.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a93cd577887e7aa9ccf40e0c3745702a/zirewej.pdfIn PDF document text
- https://baxsporthorses.nl/userfiles/file/9894703078.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6466ee6dd0---gofuzovusidogiguzetojefe.pdfIn PDF document text
- https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/675fk9h8m8jvg9l3goia6af9a6/90039225836.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608403234bbe0---1723214801.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/htbqff2i7pjn99bpjj7djvhvub/zalubidusolorude.pdfIn PDF document text
- http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/07bc371e88dd4860e20906cc6c49cef0/61832688045.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7b678ee3502c0bf284386a94ac2d9385/65778060349.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207e699d7c---mulakujikugudubejitotumaj.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf91ec6445---mixiloranuguwo.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c29c8b5b1918a0e015a273e8a7908eae/xilanolisidas.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bqj7vagllniv773osj9rpfr4r1/darini.pdfIn PDF document text
- https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/fb4fa24c29f824c723e6f45c8d0e76be/68603775150.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/23360456687.pdfIn PDF document text
- http://twozonechickenlasvegas.com/uploads/files/rolumataletewaputiju.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe6e838ce---wotexoxoxuranije.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf0ace72c7---12517560739.pdfIn PDF document text
- https://isabellepieman.com/userfiles/file/fakozubago.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af25576a1---midojuvisiwinenubexodu.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b3308f419---32774769925.pdfIn PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/9ac07bc8c06ab5f45830800f06e0a980/nupogukesebotisim.pdfIn PDF document text
- http://amajyuku.com/files/files/95867551880.pdfIn PDF document text
- https://store-connector.com/_upload_bilder/_filemanager/file/23897989038.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_off0000ed4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED4F	17572 bytes
SHA-256: `5529689f112aa7b4b542863320c0ea408c906e69f848c0d365cbb5726eb00573`
`font_01_sfnt_off00011afe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AFE	10940 bytes
SHA-256: `ca9da4b7690f8ae197c43f6042cace7f21f733b71e9c08a3345b325a4a68c413`
`font_02_sfnt_off00013496.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13496	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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