PDF malware analysis — malicious · ca08b316eaca8992

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 06:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: a97911896cc716277b1c4b328ea29b53 SHA-1: 6810c4706abee44da6529eb606a944d289a3ffda SHA-256: ca08b316eaca89923197d1a804e25f79045e8abd8d3bba400f3b7e3791e72aa7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination or for SEO manipulation, common in phishing or malware distribution schemes.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 http://pobierzplik.pl/uploads/files/pawuvinojutiguvo.pdf In PDF document text
- http://dongduong.net/Images_upload/files/labevamu.pdfIn PDF document text
- http://nwatchonline.org/userfiles/file/vixeninanelakomif.pdfIn PDF document text
- https://srilangkapools.com/contents//files/21301028371.pdfIn PDF document text
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/hh8phjqnuamdsabmsjpb3062ig/80237120749.pdfIn PDF document text
- http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/wegejeneresoweredunide.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b8fdee4f---donotomiginele.pdfIn PDF document text
- http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/79157586840.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a130040dcb8---38653426251.pdfIn PDF document text
- https://interface-graphique.com/upload/editor/file/pegurapodixet.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/83njktrfh20eektouikfkhpqc7/ganorejajijasizekox.pdfIn PDF document text
- http://form4concrete.ru/pics/cont//file/3325776571.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0c1478002499178d56b917babf5f91ef/lotovimosopapudokukud.pdfIn PDF document text
- http://maroba-zirndorf.de/file/8882479678.pdfIn PDF document text
- https://vanchuyenduongsat.vn/upload/files/7937924019.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161218a0d5e605---14756073031.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1cfum95jm6fmnngu53jftl7mfn/61945515971.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4186dc2aa7---97625788145.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/l1thd88gbc7bjmfo3vmebi58u0/87917295902.pdfIn PDF document text
- https://fallsplat.se/file/rabuvome.pdfIn PDF document text
- http://a1-automotivegroup.com/upload/files/nosutemarowaregabudomudux.pdfIn PDF document text
- http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/66911557217.pdfIn PDF document text
- http://noxsun.com/jingkelun/userfiles/files/20210629000703.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a66b2efa---mikoririkiziravobubuw.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/cp8vueltj2gucrr1cltackkhd4/ralisifapupafirapavuru.pdfIn PDF document text
- https://www.abrasco.org.br/ckfinder/userfiles/files/94799985621.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bible+verses+for+college+students+stressPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d049.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD049	10848 bytes
SHA-256: `09701dba3ca2b1fe8758e19bcc3d93a59c46b5b3d9096430ee4436ee68877379`
`font_01_sfnt_off0000e948.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE948	17120 bytes
SHA-256: `502871728d892c432e72a3e930393c8df7a0b18edb929b20b1ea90b88ab35a3a`
`font_02_sfnt_off0001159a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1159A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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