PDF malware analysis — malicious · b3d4e5b419f06ca6

MALICIOUS

PDF

95.3 KB Created: 2021-09-21 19:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 93ce08568df646a36b4ef4dbf8a6e591 SHA-1: fabb19762fe4d4fc614fb31e657997ed261785b3 SHA-256: b3d4e5b419f06ca6dd4bdea22809663811de23042e5b56674a301fcb562a6581

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on compromised or disposable hosting. The presence of external URIs and the 'Macro/content-enable lure' heuristic suggest the document is designed to trick users into interacting with malicious links or enabling content, likely leading to further compromise. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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
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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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://pixomot.ru/uplcv?utm_term=how+to+listen+to+a+pdf+on+android PDF link annotation
- https://endobible.com/userfiles/file/koxegitinixovefog.pdfIn PDF document text
- http://fpempresa.cen.es/userfiles/files/56236438345.pdfIn PDF document text
- http://cuisinescartier.ca/upload/editor/file/10629259243.pdfIn PDF document text
- https://mimpishiosatu.com/contents/files/56320907712.pdfIn PDF document text
- http://uteambio.com/upload/files/ruvoramof.pdfIn PDF document text
- https://yellowstonewildlife.com/resaxudowupasas.pdfIn PDF document text
- http://yokosohk.com/files/fckfiles/file/totoxipaxoxopovomaxejule.pdfIn PDF document text
- http://mudrkanuch.sk/editor_uploads/system/files/dokubazamelewovatamegeke.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614823f125316---difokudix.pdfIn PDF document text
- https://ldoris.com/upfile/files/20210917015739.pdfIn PDF document text
- http://grupposcorcia.it/userfiles/files/fozejidi.pdfIn PDF document text
- http://sellmysayarah.com/userfiles/files/5374031922.pdfIn PDF document text
- http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fafukeji.pdfIn PDF document text
- https://havilahbuilders.com/userfiles/file/desafusi.pdfIn PDF document text
- http://britishcytology.org.uk/ckfinder/userfiles/files/48923904903.pdfIn PDF document text
- http://lasantitosrestaurant.com/userfiles/file/9965879649.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614452916aa32---48392028280.pdfIn PDF document text
- http://www.santamyoga.be/images/file/9912242680.pdfIn PDF document text
- http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/jarikunabozovedez.pdfIn PDF document text
- http://uro-medical.pl/zdjecia/fotki/file/77550816764.pdfIn PDF document text
- https://www.willmarareachamber.com/ckfinder/userfiles/files/jalesobimavakonetoti.pdfIn PDF document text
- http://ippon.lv/uploads/File/kavufevet.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d8043b20---85406377736.pdfIn PDF document text
- https://ladangmimpi2.com/contents/files/67060984068.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://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_off0001120f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1120F	18516 bytes
SHA-256: `81dc60d8531586468ced157ee24c1692777e90f6b2599d03f004faeb10b77da2`
`font_01_sfnt_off00014168.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14168	10568 bytes
SHA-256: `a932ab10610dc4fc2d4aaa86cbf19e05fd96ab5ecafe2f326f4d06e72ddfd1c1`
`font_02_sfnt_off000159a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x159A6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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