PDF malware analysis — malicious · 0452924659c3a26e

MALICIOUS

PDF

92.7 KB Created: 2021-08-13 21:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 944b5a3cc68fa80f0cab98065f6f0748 SHA-1: 6e7eb89346b5f980e246105bf915fcad52867a7e SHA-256: 0452924659c3a26e24c263257a4e9e0331dadaa6ed5233b784772ff452db6945

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=concepto+de+la+cosmologia+en+fisica PDF link annotation
- http://teenaramainc.org/clients/875997/File/metevibazadewobawaxe.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9df02117---3747850514.pdfIn PDF document text
- http://baaningdoi.com/file_media/file_image/file/91552313941.pdfIn PDF document text
- https://pelletier-tp.fr/ckfinder/userfiles/files/91003661949.pdfIn PDF document text
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2280d613b2---fizapuworeratemozik.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608950227600e---37661710342.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/198fa75ab4783287e2627b027b1d1e7a/53667946880.pdfIn PDF document text
- https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/xuwaworudizogegipegojalok.pdfIn PDF document text
- http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d085cd0b24d---8827273822.pdfIn PDF document text
- http://portalcom-b2b.es/img/user///file/_0142587001624184579.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ed6ad230f65788ffaadb78eefd99dbc6/nozitufoberajujeleves.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4s06qju76rg1kolijgqaaq1vg4/5739287040.pdfIn PDF document text
- http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/dazomisopevabakobiw.pdfIn PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0141801e5e1f6b1ef60306a056c4ea76/rasenotumalud.pdfIn PDF document text
- https://artenika.pl/fck/file/24089110797.pdfIn PDF document text
- http://4grd.com/cmsimages/file/beferivudodo.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9ec790d72ad70aae8d391d82da15caaf/42722675767.pdfIn PDF document text
- http://atomiccm.com/userfiles/files/gakifun.pdfIn PDF document text
- http://ms-beauty.com/ckfinder/userfiles/files/fojipurolilebawetegofigur.pdfIn PDF document text
- https://dejavuruse.com/userfiles/file/sumafonofuzenozowimix.pdfIn PDF document text
- http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/bitukijarebuluteluzojeki.pdfIn PDF document text
- http://dogable.de/userfiles/file/relikejekepaxikodetitomil.pdfIn PDF document text
- https://turismo-galicia.es/ckfinder/userfiles/files/zuxawubezitejikonuvuk.pdfIn PDF document text
- https://flour.co.uk/ckfinder/userfiles/files/soxebolekevigirajirusinad.pdfIn PDF document text
- https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/jarokefavasupefase.pdfIn PDF document text
- http://cs-web-design.de/ablage/userfiles/files/93005996825.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_off000101a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101A7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000119b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119B9	20188 bytes
SHA-256: `4f67cc09e06084eb9102c3dca739d159b64d99a90265fe84cba574d36993988a`
`font_02_sfnt_off00014beb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14BEB	10892 bytes
SHA-256: `bc042586d006443cc32630ce4c572a478b46c6ed0d31ab258c104f20d8557438`

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