PDF malware analysis — malicious · 8a0f9c88fc4331af

MALICIOUS

PDF

90.3 KB Created: 2021-07-04 15:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 090953192e4870fea6f71d9ea86a674b SHA-1: 557cb8b5f3c69fab5cf494902249e03b630a526d SHA-256: 8a0f9c88fc4331afeaf7fb32ce132d13e1bce20f396909d3596906eb0a337047

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them to further malicious resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090154f980c7---govizonikumifezuv.pdf In PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8fd9320e---28287590695.pdfIn PDF document text
- http://alburigiott.it/userfiles/files/50356086221.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/29303371068.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8adeb49227b0aeb2cf874d6471de4f8c/5496900186.pdfIn PDF document text
- http://nct-vn.com/userfiles/file/94649670830.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/39fad0bd781faba464d439ecc7f144a1/7177952089.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787cbe3c3b0---werapimufopekotowub.pdfIn PDF document text
- http://ixtvs.de/_upload_bilder/_filemanager/file/zepiw.pdfIn PDF document text
- http://naturalmis.com/userfiles/file/81197132801.pdfIn PDF document text
- http://josephlillianmorrisfamily.com/clients/59960/File/73363333889.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/14a4c5b5d61eb8f21337d9e1707e0dcc/8597067955.pdfIn PDF document text
- http://thuduchouse.vn/pics/file/kumugabutuja.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb504acfcd6---9276987120.pdfIn PDF document text
- http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce32a17b3---doxalijeg.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3455774f213d4babd240505b05334a07/37814505004.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55b6b90ab---kukizuxurojilebuvi.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608104d967590---88256473581.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160766cac984b8---2763161460.pdfIn PDF document text
- http://haohanlegend.com/Uploadfiles/files/mowufaxuxakuvedetoni.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d0fe2f60---bonigonilenerawefedotez.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a06454ab630---jeropefosusovaxujuwopi.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2dbcac6f9afe061dbff6aa41d1a913c1/3528975857.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ted+hoff+produced+the+first+microcomputer+named+asPDF 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_off0000fd78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD78	16552 bytes
SHA-256: `f49427ca104331fc863fa17ec40368929780cdedba18062b288f15a8fef152c7`
`font_01_sfnt_off0001288f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1288F	10904 bytes
SHA-256: `65d0826f0e32b5e8dae07fa9cf757d6015240165351c11f8d347b5304b39d5ff`
`font_02_sfnt_off000141a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141A3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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