PDF malware analysis — malicious · ab2a868f9bd63ed7

MALICIOUS

PDF

86.2 KB Created: 2021-09-14 08:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 5415bbbcaf34859a527506bc2577a581 SHA-1: d63f6bc1361d6cf287a67aba5c9adca298e95966 SHA-256: ab2a868f9bd63ed721534e01a5c4ac6babd8823741413f81efe19f3981c5f3e2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL distribution are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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://chcial.ru/uplcv?utm_term=how+to+change+face+in+video+in+android PDF link annotation
- http://www.alex-vasilkov.ru/images/wisdom/file/58469017248.pdfIn PDF document text
- http://elitsatodorova.com/uploadfiles/file/mijabowanigidu.pdfIn PDF document text
- https://weilaimachinery.com/userfiles/files/fokibeside.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e0798ea6---18558827156.pdfIn PDF document text
- http://meyergarden.com/ckfinder/userfiles/files/viwejotojomadaw.pdfIn PDF document text
- https://siemreaptraveltours.com/userfiles/file/94056380188.pdfIn PDF document text
- http://yasaitogo.com/uploads/files/nalibuvefufuxataniluwes.pdfIn PDF document text
- https://gonguyenkhoi.vn/upload/files/96338345141.pdfIn PDF document text
- http://eubeer.vn/uploads/files/97991737321.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ed3c4eaa95930e935ce672df0baec0f1/vekiludasum.pdfIn PDF document text
- http://hugslock.com/app/webroot/img/files/jamomaziragugerirasobe.pdfIn PDF document text
- http://thuephotocopytaihanoi.com/upload/files/86772858649.pdfIn PDF document text
- http://execdentalclinic.com/uploads/ckfinder/userfiles/files/8509903538.pdfIn PDF document text
- https://lrsdev.com/userfiles/file/sogovemometewevik.pdfIn PDF document text
- http://sangiorgioautoservizi.com/userfiles/files/44494751163.pdfIn PDF document text
- http://esangsok.com/upfile/files/pexosemosumijipisijen.pdfIn PDF document text
- http://sreema.org/FCKeditor/file/18849530441.pdfIn PDF document text
- https://ksboutlet.com/file/files/5720664201.pdfIn PDF document text
- https://detmers-kontejner.hr/files/munukakopa.pdfIn PDF document text
- http://tbeaindia.com/userfiles/file/besaninoxujakev.pdfIn PDF document text
- https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/819cfa745b1a61963d36b1d10c00a3cf/61315373695.pdfIn PDF document text
- https://bimetoor.com/basefile/bimetoorir/files/28438525671.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_off0000eaea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAEA	10684 bytes
SHA-256: `e5a79bce23b249ca01ead92aba1aec8467489e88fa95ea08f3cef3984552ad48`
`font_01_sfnt_off0001032c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1032C	18316 bytes
SHA-256: `0ce8bdf24484ce3cf98b013cf323d3ac45c0fc9c619309557637ea335c3ef260`
`font_02_sfnt_off000132aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132AA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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