PDF malware analysis — malicious · 8374f1eb19f98413

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 09:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 8c8f096b98a0da29d85cd5cfa68c0ce1 SHA-1: 9a80474c5dc3d62a19de8630a9d96872f2fa18e4 SHA-256: 8374f1eb19f984131ce8addc86b9eb77d8d02a927a4f8ef17be9af3c66e2e321

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful external content. No scripts were extracted, but the overall pattern suggests it's a downloader or part of a phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=weight+limit+for+a+first+class+stamp PDF link annotation
- https://pk-kuepfer.ch/ckfinder/userfiles/files/96828633231.pdfIn PDF document text
- http://360mart.net/uploads/files/34185117322.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca31de042---wevun.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qg3d0jbn1nt2070c7cm0r004bm/zaxoraf.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a1fa6cac---59821780093.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4530b47d50---wopologixijelimul.pdfIn PDF document text
- https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacd41f985---2671247160.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/3g1nmfvg62pf32bg031ffhejer/3098124845.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076617d7fe21---pobopuvelegipukagi.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f602c063153f317b1283a7fbd9ff43e2/4237978347.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/govizesuruzed.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eb8dc632b85a117e0d2d731bc4bc9bdb/gixegagol.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6201a437d---87042766893.pdfIn PDF document text
- https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e39e7315956b97db6502b10808a32f94/fadubamepopurufiwisoba.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c396e331580---fabawonofaselobigokifefi.pdfIn PDF document text
- http://grandinhr.eu/images/user/file/gupojikazesepalesutobawi.pdfIn PDF document text
- https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c5bb0ac7afde642ceba75c81540b04b3/79464392492.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc41ad09e97---munisufu.pdfIn PDF document text
- http://eurekaelearning.com/upload/news/file/1238434940.pdfIn PDF document text
- http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607755edde295---58706508249.pdfIn PDF document text
- http://stalmost.pl/userfiles/file/kedogazovezonadiped.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/551246022ac6891fd84cb4f5b18fd3f9/60079578078.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed00bcd98---rekokeladakuraxena.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_off0000ee30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE30	19500 bytes
SHA-256: `6c491e054a813164d796229b9be95e80e6df3a8324c72b5801d62535d3dab749`
`font_01_sfnt_off000120ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013906.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13906	10816 bytes
SHA-256: `fe699d130ac2b96c6e857c3dcfd5a688b447afb73d7d70927e6db7ed3725b5a2`

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