PDF malware analysis — malicious · 633943e02a4ce74c

MALICIOUS

PDF

86.6 KB Created: 2021-07-28 07:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 83ee671fc8c298a024a41fae2cd52dce SHA-1: 677833448ff251a469b0150b6ce38b6f7b6e4754 SHA-256: 633943e02a4ce74c2b9a837ba3abe211cecc49ee5aab8c4d9fdef110a3ffcbd3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute or host malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/76a41b3e2917c129fe01d09998512883/xuzifax.pdf In PDF document text
- https://kientrucqhouse.com/uploads/image/files/55798941082.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8632306257f1a715b015462fda908c0d/91663483128.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad829d81c84---41459578303.pdfIn PDF document text
- http://austral-immo.com/userfiles/files/40341251271.pdfIn PDF document text
- http://naitikfashions.com/ckfinder/userfiles/files/sanunitiworuxob.pdfIn PDF document text
- https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5ac99be5c0c6213b593bdee1e9060508/17119052648.pdfIn PDF document text
- http://www.groupementpecheduloir.com/ckfinder/userfiles/files/61601995536.pdfIn PDF document text
- https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/c016aee94c08f09f33df5d980cc47112/81073918467.pdfIn PDF document text
- http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/50460227287.pdfIn PDF document text
- http://teresachild.com/upload/files/rajabixuluzax.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/obiv1unlf092i3kj8gskqt2j7b/waziterev.pdfIn PDF document text
- https://darshanam.com/ckfinder/userfiles/files/tutet.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dc64b6d999e8776ad98ed4c7be089f23/vafaki.pdfIn PDF document text
- https://annjulieskarpmo.com/userfiles/file/jowivasozip.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1995fe0cbe19c7525170ab04a017404e/86760504847.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607086d9110ed---gutukozugiwoxi.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cae38ed8ffd9c98adcafd6bc2b720d3e/tagoxabivar.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1622471448.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d823dbc3a---18799161763.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dbe77fa0d---63283764555.pdfIn PDF document text
- http://kidsjeodo.com/images/files/48195004337.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c72319c49dd92536294e88e93fa3012c/23111538619.pdfIn PDF document text
- https://bem-sa.com/img/file/53101629061.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+introduce+yourself+to+new+staff+via+emailPDF 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_off0000eed0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEED0	16776 bytes
SHA-256: `241fc3cdd412bd8e5a57777fd0c622d528b20ee67b1e25da347bc5695467ef2d`
`font_01_sfnt_off00011a7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A7A	10996 bytes
SHA-256: `6301490580eefc5e82945633044780243c7abb6ddfd8de2085459986be714ce3`
`font_02_sfnt_off00013410.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13410	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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