PDF malware analysis — malicious · e88ada51558c4373

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 20:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 5d81e0a87489834b02fddeaa5d94af30 SHA-1: eef14c287ab9aa2cee8580c28d3da13d65e1ecc5 SHA-256: e88ada51558c437399d3037c6c694fa5a854ed5d8e0ca7f116575b183b7783ee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to funnel users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://bjsprt.com/uploadfile/file///2021051216241133.pdf In PDF document text
- http://elateridae.com/images/FCKeditor/file/78867961671.pdfIn PDF document text
- https://hoanghaie.com/Images_upload/files/65145911872.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed6dc2e73---xiripadekuvivunur.pdfIn PDF document text
- http://ambvetsanprospero.eu/userfiles/files/duzukik.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d36ghi0pbtlu4t91nvecdaeqo1/5887509306.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqjoaidqbn3jera5fp1r2qi7q6/50700846095.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b40abde3b52---dewobunowokasebuzolimifoz.pdfIn PDF document text
- https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c4a31c5b253fa78fa86d735234460810/zikuzobokokudezoduriw.pdfIn PDF document text
- http://smsalumni1971.com/apadmin/uploads/userfiles/files/32954860615.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d498206f8---kosozugijilipukeduromu.pdfIn PDF document text
- https://pnp-studio.com/fckeditorfiles/file/mitajerunodemalozibawatet.pdfIn PDF document text
- http://alliance-ltd.com/userfiles/90181063997.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d9b07ccb---zilikuzuwuniloxugi.pdfIn PDF document text
- http://debden.org/userfiles/file/jagidobebuneruxoxi.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15193830caf789321362c422b37893d9/66383115020.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/la5ck6af12aj6grtoq8033kidf/9530042328.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610054f8c806c---vexogizelik.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb6e946be---busipopovikobameg.pdfIn PDF document text
- http://yunnanyingxiang.com/ckfinder/userfiles/files/bevajijufolexo.pdfIn PDF document text
- http://dj-venci.com/uploads/pages/files/97181479076.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5da18bd2d---8303586258.pdfIn PDF document text
- https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612db6acc2045---dutekovawusifefikip.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/60b53efba130536691426ff91b2b4c46/nafebaganekumonowin.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dcad99a0d---20500023960.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+jpg+file+to+pdf+formatPDF 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_off0000dd53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD53	17200 bytes
SHA-256: `b4c356a7365a97b9a692e3e24cf2da8b11e4b041b27f0c50e209000c9338bded`
`font_01_sfnt_off00010a28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001223f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1223F	10900 bytes
SHA-256: `98c11969f65ebc12f926dada52fa0f0b85d0beb365157f7ee84fc609ff9e4a02`

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