PDF malware analysis — malicious · bc9b326e6eaa979e

MALICIOUS

PDF

103.3 KB Created: 2021-09-03 17:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 533d8cf54d8693fd115a847336c4ce91 SHA-1: 181d80d8ba8032cc86c29b1400577f735b556ce9 SHA-256: bc9b326e6eaa979e1fd8bf3cabe478f2f1c74e56f32ede0725aab5b17314582a

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 pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The primary attack pattern involves directing users to external, potentially harmful resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9877

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://synerhu.ru/uplcv?utm_term=changeman+mainframe+tutorial+pdf PDF link annotation
- https://lescourailleurs.com/upload/editor/file/74897820796.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/715493ee38373a483dd46b9d77fa5348/jowapewiwalomef.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7ce2msov57j54ve8baogt3gbgf/tuwexagupevu.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/177160cc3f0b29e2988592290f6ab0ea/35567139074.pdfIn PDF document text
- https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/97731995841.pdfIn PDF document text
- https://stpeterscbs.ca/ckfinder/userfiles/files/zulubadosuxusovonisege.pdfIn PDF document text
- https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/86e102036eb52175c938daccc23d943c/vibewowo.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63bb3b4e---vimeputisojubofeme.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fmh8ug0ehhocg9dfj2mope981p/93962906090.pdfIn PDF document text
- http://ezibra.pl/upload//file/nubipetiridirobelikeme.pdfIn PDF document text
- http://mikailang.com/userfiles/file/20210803154212_1712124784.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744f11666fe---98349955388.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8cd4a5c949febb3417cf4c31af13044c/24738003403.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/483e09b40c0c0509a248b1844bb8bd80/debogubadoxaz.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ceab77ea76fc9578d1cb6c8e9a595683/fanoxewunewunijunalagoboz.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210705002922_bg0ubm.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0fa5360782d6804e8c188a7e7c0de45f/24858379548.pdfIn PDF document text
- http://pixel-pro.ru/upload/file/32482581631.pdfIn PDF document text
- http://skrabl.pl/www/rpbd/fck/file/winuzakafurisekubamoj.pdfIn PDF document text
- http://hndgyl.com/v15/Upload/file/20216132152384139.pdfIn PDF document text
- http://cariboohose.com/userfiles/file/23989994568.pdfIn PDF document text
- https://uniontend.com/userfiles/files/gegojokebu.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094aacbf3c52---baviziputofifubajaz.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b51c028e---zopopunifeloso.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/kirotafo.pdfIn PDF document text
- http://adveotec.com/img/file/moxivagolupoxa.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_off00012777.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12777	10908 bytes
SHA-256: `088cb34ebf442fc196b2a4c93f1edd88398bafbc80716bd9b0ec2cb2b1a90aa6`
`font_01_sfnt_off00014043.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14043	20304 bytes
SHA-256: `c6bbb4ee0cf8bbde86138ee0bb7a463993e75473a98c20e19981c91538d5b994`
`font_02_sfnt_off00017565.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17565	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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