PDF malware analysis — malicious · bbe443aef9b00a21

MALICIOUS

PDF

148.4 KB Created: 2021-07-08 13:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 941e169c28b6141e346fbf33c2244630 SHA-1: 5215c413f2942cff546154e10c0cfee825839872 SHA-256: bbe443aef9b00a21616707ccd52b7df69a784f0886fb8acf05840645c20b5a5e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious URLs. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to phishing sites or download further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9733

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://oniceh.ru/uplcv?utm_term=smith+and+wesson+model+59+owners+manual PDF link annotation
- https://bmw-zona.ru/uploads/file/fodiv.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/pkj9akllrie8dg0tbc9qvb1bn1/jizarad.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d18f8b74b---22086123810.pdfIn PDF document text
- http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fd2d2030---wajukizodogineril.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdcec7db33---ditovigoxikodofevis.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/06f88d341542fd824b29acada9d179b6/34919883154.pdfIn PDF document text
- http://mousike.it/img_ins/files/82776685049.pdfIn PDF document text
- http://brnc85.com/clients/878796/File/judawarafefazipobom.pdfIn PDF document text
- http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9d3n6ikla564dia977o6npcrj1/woninexeniwev.pdfIn PDF document text
- http://animationcoach.com/userfiles/file/59484084512.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7be5a2a3---kukonez.pdfIn PDF document text
- http://elfuklid.cz/foto/Image/file/beguniwegesuwitigagirexig.pdfIn PDF document text
- https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae97815d84f---35359436147.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe4dc5d5a---37741912356.pdfIn PDF document text
- http://brkvinc.com/userfiles/file/20404280529.pdfIn PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/066e5720a380a497f1a25922b03111b5/luvirolujatizasi.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608730432ccb2---95007274843.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/69739899817.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b8ff234b51db226465a6cb3981a28b06/1099759381.pdfIn PDF document text
- https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c10c76e62ad004d9103c6a0e5903ef4e/lasuxusukakawemuzasoga.pdfIn PDF document text
- https://dermatologie-francophone.com/userfiles/file/86717756029.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/73546209027.pdfIn PDF document text
- https://atpl.aero/ckfinder/userfiles/files/kulizuz.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/kamunolipoda.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6caf168b7---6865406244.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001c964.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C964	11076 bytes
SHA-256: `ef9ac3e4ff1dcc42ee1f87b83736ec4ac6abc2618194ea27177e628cfe88f05c`
`font_01_sfnt_off0001e317.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E317	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001fb29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1FB29	18224 bytes
SHA-256: `7d9c69f155b4cc0dc2bf37038a41f53c7073bf2a74e64dec5c36e65a51b9eac2`
`font_03_sfnt_off00022b89.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22B89	16304 bytes
SHA-256: `72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee`

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