PDF malware analysis — malicious · edb31b52de215295

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 01:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 33e3349316f3ad22e58cac9db3d7e0a2 SHA-1: 5944cb118036d64f9e6dd5059a7ff30ee1dc73a9 SHA-256: edb31b52de215295ec563961069650233187d249cd2c8b6eb55758336a5ff6f1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure itself is also noted as a link farm, further supporting this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=coordinate+graphing+worksheets+for+6th+grade PDF link annotation
- http://orhs76reunion.com/clients/30721/File/82755864628.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077329f8d376---seduwuzitefagabaxurikupu.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e7c26c2d25d51c378489bc0a85defe20/35527863292.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9204411d9---72447742278.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8fdd649fe6bce4623c3128b059c27fc1/tugiwapejujopilesobugexo.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608468a5161c8---84301448699.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1189ca8294---kukase.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29f7dd96a2---fimabox.pdfIn PDF document text
- https://leavereview.com/customerinterview/ckfinder/userfiles/files/vezotikazunezapi.pdfIn PDF document text
- https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/i59ifppq9cm3te1eeujaanugr7/turiwimok.pdfIn PDF document text
- https://raptiherbal.com/ckfinder/userfiles/files/8456386883.pdfIn PDF document text
- http://sovaimm.it/userfiles/files/48354004239.pdfIn PDF document text
- http://faurerom.com/userfiles/file/javivamupenifebogi.pdfIn PDF document text
- http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84860852802.pdfIn PDF document text
- https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4ec5c945f0362919a0517fad7b262bb1/79554153010.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb345e5b74---92400357891.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f65a24da7---vukurijidusobi.pdfIn PDF document text
- https://dianthusindustrial.com/resimler/files/10076011855.pdfIn PDF document text
- https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6146aaf68---87146991098.pdfIn PDF document text
- http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/mg70k1snpau89ic1l183cf2k57/komuvidetaxudazerekab.pdfIn PDF document text
- https://www.vignolaweb.it/ckfinder/userfiles/files/84804516826.pdfIn PDF document text
- http://reicar.dk/userfiles/file/65718314258.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/xakewiderifaverutoku.pdfIn PDF document text
- http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/vifikejipixafi.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f012.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF012	19428 bytes
SHA-256: `954c84033826b2ae14c6af3502da2148fe5935a3678c121f2052c9452fd29599`
`font_01_sfnt_off000122b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122B6	11108 bytes
SHA-256: `9225f7c44ec49820b63ee55db63fdc158c1be3dfadb14bf4bb52a36b090879c7`
`font_02_sfnt_off00013c79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C79	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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