PDF malware analysis — malicious · 9319efb3f5e7df3e

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 13:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: dedc2a068a2d379c3fd0d16a8fbd7b24 SHA-1: 9613a7f4d9b22615ed86e0ae86505338fa2fe6d8 SHA-256: 9319efb3f5e7df3ed638aa77433658d7a734fc829bee014dd31b681192891204

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9744

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://liyangah.com/Upload/file/dezanivabuful.pdf In PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd1362316---kexigenumufowi.pdfIn PDF document text
- https://rubenferro.com/userfiles/file/wijiwo.pdfIn PDF document text
- https://marblobath.com/app/webroot/img/files/75513190070.pdfIn PDF document text
- https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/runurulobogatovajofikagen.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c7a8998f8bf924542a68d7a9fbb87e68/46096505430.pdfIn PDF document text
- http://zhhyhb.com/uploadfiles/files/sukejej.pdfIn PDF document text
- http://staractivecollection.com/resimler/site/files/18977362325.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9188f5183d0726025e0c9aea294cfe38/27211654500.pdfIn PDF document text
- http://xn--szabowski-tub.pl/userfiles/file/suzewumefalupem.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160874d6f4cb9b---kaduwi.pdfIn PDF document text
- http://jandenzobv.com/image_uploads/file/82412267566.pdfIn PDF document text
- http://falerisztika.hu/tmp/44391981243.pdfIn PDF document text
- http://packagingandfoodmachinary.com/userfiles/file/bamixuzogovabebula.pdfIn PDF document text
- http://kavtas.com/images_upload/files/77654220765.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af25646228d---7776564058.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1cd81efd3---sojojomirira.pdfIn PDF document text
- https://mysilo.com/upload/ckfinder/files/pedupisutuxudodeduviroz.pdfIn PDF document text
- http://bakefruit.com/uploads//files/202108120235167749.pdfIn PDF document text
- http://tatagz.com/uploadfile/files/77251593673.pdfIn PDF document text
- http://soeurs-scjboran.fr/soeurs/upload/files/vefefinukasezoliwinebexi.pdfIn PDF document text
- https://vicentinacentroautomotivo.com.br/ckeditor/ckfinder/userfiles/files/zevazasari.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/it98anthmsm2pl5ro6lq0murnu/31116919674.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f87166190e7aeed6601d7e07882b803a/pemujituwa.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070321a4f0a8---fonuxisivofet.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb013ebd2---zatelerabemuluto.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ap+grama+sachivalayam+selected+candidates+list+pdf+2019PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000da1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA1D	11572 bytes
SHA-256: `5d47d7856e40bf146dbba4ad3922c5bb3539bb0db159ddd5ace53ddc13213d64`
`font_01_sfnt_off0000f55a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF55A	16244 bytes
SHA-256: `fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d`
`font_02_sfnt_off00010b48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B48	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001235a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1235A	20448 bytes
SHA-256: `89dccc77bc64076b021fc5ebf809a6cd3af6fffbac77777d1773af92b2fc3854`

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