PDF malware analysis — malicious · b36b8a204ed60729

MALICIOUS

PDF

81.9 KB Created: 2021-08-30 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: b03ce4c929890df3657c42f903c09e67 SHA-1: 5ddc7db0e3d32d23027f0ba6a9b3ab9fe030462d SHA-256: b36b8a204ed607298d42272ae0f06a339a90971a12ff50ec0d3285f1ef23c7eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and other disposable domains. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to lure users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://garglob.ru/uplcv?utm_term=signs+of+a+heat+stroke+in+humans PDF link annotation
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7d40b669---54717895768.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/68cvkriatm68f2oed92bspgln3/pikemiruz.pdfIn PDF document text
- https://marathonroller.com/userfiles/files/16393847565.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e258293430d---36747374771.pdfIn PDF document text
- http://china-engine.net/ckfinder/userfiles/files/girew.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/tbb59t6dgac3hu2m28114osf68/tonowukivedigaborulemaful.pdfIn PDF document text
- http://natproperty.com/userfiles/files/faluvemanetebiraw.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbd117ac4f---zezefolepujotatidu.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160764c476a7a7---wiwukojosufa.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hqoiqor6dh2m29ep7jchc8ue65/44647483641.pdfIn PDF document text
- http://champaigncursillo.com/userfiles/file/45375225664.pdfIn PDF document text
- http://brilspa.ro/userfiles/file///9986526010.pdfIn PDF document text
- http://cncforginghammer.com/d/files/76793608558.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021051005505773499.pdfIn PDF document text
- https://peiitw.com/Upload/ckeditor/files/49191371755.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116afe3a9bf6---vezogefegujij.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/99295d3ddb1c37cda12c1028078d6833/jixodorofefil.pdfIn PDF document text
- https://mebelihome.ru/upload_picture/55342332489.pdfIn PDF document text
- https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/94455656916.pdfIn PDF document text
- https://tideandtigers.com/ckfinder/userfiles/files/wamexemuzejofurip.pdfIn PDF document text
- https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a00d5bfb---lavuf.pdfIn PDF document text
- http://ohsongpharm.com/ckfinder/userfiles/files/53484668291.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa5b88461---4378593190.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/gcppfb7ckmtvgnp4l0vk01ngv1/lukenufemixabi.pdfIn PDF document text
- http://washchienluoc.com/upload/file/28593624577.pdfIn PDF document text
- http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/49449707519.pdfIn PDF document text
- https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9e2e5007---7152365146.pdfIn PDF document text
- https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/79b1a6fb5409a2c7685b2cc2433d8c49/paxolodejevejarolawo.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_off0000de5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE5B	10880 bytes
SHA-256: `eafdf849d7e9f27cb39e178ed3946b02967bea3ae77a2e8696b8e034c4ed9a9f`
`font_01_sfnt_off0000f756.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF756	16688 bytes
SHA-256: `2dd58f7929f1e83ecafcd0a53fd2f9b0e287ae4268d83147d636c640e60d2e91`
`font_02_sfnt_off000121d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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