PDF malware analysis — malicious · 4b77e02bc0217f70

MALICIOUS

PDF

87.0 KB Created: 2021-07-30 14:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: e5195134dda7ab54f7d0f7c887b0e681 SHA-1: ddfb9c134d7543629cf96a3641445014b68437a5 SHA-256: 4b77e02bc0217f708b10951c41d74136bb19ad362949af89df9f330052806048

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the nature of the links indicates a likely intent to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://stpeterscbs.ca/ckfinder/userfiles/files/86819075476.pdf In PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/25124b5fe7bee17fba13121601d99a10/3592579720.pdfIn PDF document text
- http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/ziwafi.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2dd57cf01d9ee76e677b8ae2cb8b6bb9/2688990387.pdfIn PDF document text
- http://poultech.net/d/files/32500504778.pdfIn PDF document text
- http://rococosofa.com/files/files/24955131250.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/84df4e62e2b68664c0f7885912dcf1aa/71296880080.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3d1d54snkm59bruihbf3be3vl1/89251732228.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5lvp2bn41h027slmhr3jnh81va/zunewedetekam.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5694973fb4---romiwawedikisa.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160809424c2513---pekabagolosefa.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084244dd4cce---80012468718.pdfIn PDF document text
- https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac69ff3e77---85903440535.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff1b747dc---93756841003.pdfIn PDF document text
- http://nordicaluminium.ru/userfiles/file/27352537930.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d61b0358cd1666adcc37647124b2a39d/50758202115.pdfIn PDF document text
- https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f41e8881dafc50fe124274bebfb7bd/8384641982.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/703cba0f010d45a3ac9d0d6537fd9e58/3948911738.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607482a25b368---vaxodubawetiwo.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d6984e93c9c1a5aa9755775a5fa7ba09/67665682960.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c06ebba51---3052931619.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/33481576340.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hull+house+easy+definitionPDF 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_off0000f0fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0FE	10556 bytes
SHA-256: `6225fe4a66b754ef653a87f10722e698a16c8fdaa33d49518481392785fb0f6c`
`font_01_sfnt_off00010906.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10906	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012118.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12118	17532 bytes
SHA-256: `75eac7dba1286f54cf5fd3e962e20effc5d5b3f40b6866c33c9ccccad759acb7`

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