PDF malware analysis — malicious · 040f5ff722537b63

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 1fbac8e1e823265bd22b9987a2fcbc7b SHA-1: 85439108cebe9167b6c6301370406f9e6459b2a4 SHA-256: 040f5ff722537b637796c5193ba41cb20cf6d9b5eb4c1a72a6a90467041c5ddd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of external URIs and link farm heuristics indicates a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.7511

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://nationshield.ae/userfiles/files/janojox.pdf In PDF document text
- https://iphonerepairservice.nl/app/webroot/files/userfiles/files/40118886701.pdfIn PDF document text
- https://greenlakepaint.com/ckfinder/userfiles/files/tubokepizomini.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f6141813---6626019223.pdfIn PDF document text
- https://dbjadow.pl/attachments/file/99790825203.pdfIn PDF document text
- http://www.vishalsahni.com/public/ckfinder/userfiles/files/25388509929.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608119e4dd908---nijiwekiratemowakidon.pdfIn PDF document text
- https://gtnet-engine.com/ckfinder/userfiles/files/zaxafinimewenelotili.pdfIn PDF document text
- https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/58220f51a1f2323f9ffc412932705051/76097393050.pdfIn PDF document text
- https://aulacvn.com/upload/fck/file/gumirepotijolagi.pdfIn PDF document text
- http://sakaryakasaplarodasi.org/userfiles/file/jagegimemotikuf.pdfIn PDF document text
- http://creativeindustries.ru/uploads/userfiles/file/61541241256.pdfIn PDF document text
- http://sacoorhealth.pt/site/upload/file/86406539616.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ca848720---jujiluvonoronoxur.pdfIn PDF document text
- https://francois-daulte.com/ckfinder/userfiles/files/6942595055.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9576bd52---fekidunekunet.pdfIn PDF document text
- https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/6e1e873fa1ce7644df1f820d535d2f91/nopupavebubar.pdfIn PDF document text
- https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/0321f6157d7cecaf18c6e1b4ba667964/6358491965.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9umljp612jhldor38kubk9cem6/67545115552.pdfIn PDF document text
- http://www.cenlafilm.com/siteuploads/editorimg/file/kefibimupekubovixaxen.pdfIn PDF document text
- https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/51205638640.pdfIn PDF document text
- http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/23690749228.pdfIn PDF document text
- http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f825d6bc8a---vixomufidoxirutowi.pdfIn PDF document text
- http://naviway.su/upload/files/65910439656.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070008357d8d---zejeponolemalugebavo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=stannah+stairlift+420+service+manualPDF link annotation
- 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_off0000ecea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECEA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10501	11044 bytes
SHA-256: `784432d5117a2f644dcc949b97cfc5459b617112a40d93f4a40cd9cb3a221de4`
`font_02_sfnt_off00011e97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E97	17968 bytes
SHA-256: `550149cd3e8791c35db3a2a2296680864fb10e1a5f1a05138b46ab4c14bd3c5d`

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