PDF malware analysis — malicious · b55ccc003b2c6f26

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 09:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 2266e0ccd1481eac6ea4e3e5a765b237 SHA-1: f9bcb66c8bbc36b0eacaeaaff1d5a2d34571cf60 SHA-256: b55ccc003b2c6f26a3571aecbacaf836ea5995ca5f9901b68611627f24833557

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be part of a link farm or hosted on compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://crewmak.ru/uplcv?utm_term=gta+5+android+ppsspp+zip+download PDF link annotation
- https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/33323814323.pdfIn PDF document text
- https://cafesca.info/ckfinder/userfiles/files/37288986859.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/1276692266.pdfIn PDF document text
- http://imoroz.by/upload/file/5983681004.pdfIn PDF document text
- http://needychild.org/ckfinder/userfiles/files/vikepofugupumajikuzutomab.pdfIn PDF document text
- http://rqconsultores.com/userfiles/file/devosanegatokobopizagif.pdfIn PDF document text
- https://vetregistr.com/ckfinder/userfiles/files/lipawuxadam.pdfIn PDF document text
- http://fence-alarm.com/userfiles/files/62824213955.pdfIn PDF document text
- http://palaciodelosnavas.com/userfiles/file/20853818014.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613997a2a19c8---89071186740.pdfIn PDF document text
- http://gmtshipping.com/attachment/file/kusuborawirevaradovaram.pdfIn PDF document text
- https://ozora.schaffsen.com/contents/file/6920408582.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/418e9a8cc0fab53789788870e25f6705/36798420581.pdfIn PDF document text
- https://m-isc.com/userfiles/file/13547134571.pdfIn PDF document text
- http://dtpokebar.com/uploads/files/ginaditekebimuboxilenuzak.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc4ab0bf3---37441312161.pdfIn PDF document text
- https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/36300650788.pdfIn PDF document text
- http://akcompany.vn/uploads/userfiles/file/19451177381.pdfIn PDF document text
- http://blueleaves.ru/userfiles/file/24156758105.pdfIn PDF document text
- http://pastadimatteo.com/ckfinder/userfiles/files/sarujigurumuro.pdfIn PDF document text
- http://union.travel/ckfinder/userfiles/files/81206600458.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/fizojamuwike.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b22e87b4---13823713132.pdfIn PDF document text
- http://2015.letnifestiwal.pl/ckfinder/userfiles/files/vekakuwigifo.pdfIn PDF document text
- https://tes-sys.com/uploads/ckfinder/files/20210907/16309558222334.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_off0000ca65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA65	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e27c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE27C	10572 bytes
SHA-256: `315e65ca7e4b750648f681d095f1508895cc243b8727c2599638baafe206809f`
`font_02_sfnt_off0000fadb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFADB	17284 bytes
SHA-256: `b43f9332e1a9da6e84006e5370cb55d4d913abd1ffdbd68a67a65fde11f15bc0`

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