PDF malware analysis — malicious · f786c008bcaa8408

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 19:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 4fbf151acd3fe61da8e7cca46234ddeb SHA-1: 478963a8292ee5b6bc9df1cc1bda7b8b7b75d667 SHA-256: f786c008bcaa8408bb6678ef0b34977c7b47fd1dfc2469a8420753eec1ca76b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm. Several URLs are hosted on compromised WordPress sites or disposable domains, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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=pes+2021+mobile+apk+free+download PDF link annotation
- http://doanekeyes.com/userfiles/docs/laziro.pdfIn PDF document text
- http://oroblupiscine.it/userfiles/files/38956913629.pdfIn PDF document text
- http://splogservice.ru/content/files/gasolerosugor.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc864a3bf---pegevejit.pdfIn PDF document text
- http://neodermclinic.com/file_media/file_image/file/22675908749.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5923091845cff4bc07e60a2b9ef32e08/bowotugojabenuturuki.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/06bcdf5548f33b6ab7d4fed04cd7f4cb/biralipamijilasa.pdfIn PDF document text
- http://ztkammer.at/uploads/file/zufowimuvaviwa.pdfIn PDF document text
- http://www.cpiequipos.com/assets/images/user_files/files/55250117827.pdfIn PDF document text
- http://creativecoms.net/userfiles/file/55433676654.pdfIn PDF document text
- https://webmenuplus.com/images/file/79994694005.pdfIn PDF document text
- http://solarissoft.com/img/userfiles/files/22423916662.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bc31275887288909da610e1188edc855/sutilol.pdfIn PDF document text
- https://onthespothousing.com/userfiles/file/8494921264.pdfIn PDF document text
- http://puzynowska-kancelaria.com/userfiles/file/bexogedimevebojefukosuj.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2d04ccd---23677916232.pdfIn PDF document text
- https://bbox.ru/images/shared/file/26296386070.pdfIn PDF document text
- http://apartament-krokus.pl/userfiles/file/runexozo.pdfIn PDF document text
- http://divyabodhanam.org/userfiles/file/4710925122.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ltda00smhg6dlnf7n5g51flpos/mozobirivuboxaxafapa.pdfIn PDF document text
- https://eravukappalpalli.com/userfiles/file/23274140677.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140abe4c2464---35688666804.pdfIn PDF document text
- http://kimyasaldubeller.com/upload/ckfinder/files/1722695150.pdfIn PDF document text
- http://mastervin.ru/files/file/20171959551.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_off0000dc2b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC2B	11172 bytes
SHA-256: `fc80f3ee4b5c0eb7b207ff61c67969d35346e62755ec9364f2fcd16840a16a78`
`font_01_sfnt_off0000f62c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF62C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E3E	18172 bytes
SHA-256: `30a86682723f1f389557ff3943fc5eac2add6503c9d600f07c6fa61672732d78`

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