PDF malware analysis — malicious · aa4439be9837b8c3

MALICIOUS

PDF

85.0 KB Created: 2021-08-23 17:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: a3f216136d05825106823c40bf2960f6 SHA-1: 88614e68323812e27470c4bd1b5d5f607d4ae36d SHA-256: aa4439be9837b8c37487b9f299168f357255acd0a9a7b14a190b05ece50a443f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://christschoolblr.in/userfiles/file/jupokur.pdf In PDF document text
- http://mobilesamara.com/img/files/file/22238183298.pdfIn PDF document text
- http://samurairamenbar.com/uploads/files/40843026884.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f90020d77cc---xenutudabiporumejagedinij.pdfIn PDF document text
- https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tibulomedoxedi.pdfIn PDF document text
- http://ildungrice.com/fileupload/fckeditor/file/90969352980.pdfIn PDF document text
- http://smart-ventures.ch/upload/Editor_Images/files/65238978200.pdfIn PDF document text
- https://warungmimpishio.com/contents//files/30462155795.pdfIn PDF document text
- http://glotecgh.com/upload/editor/file/zedobamapikegobodefexima.pdfIn PDF document text
- http://jiendurancecoaching.com/ckfinder/userfiles/files/jirijezonajitefubuvajod.pdfIn PDF document text
- http://kukubara.com/zdjecia/file/fekutatupamuvizod.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mt88aadk40vd43rjh4evpm8cs3/juforisenerepa.pdfIn PDF document text
- https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/raoustss1p96vio0smrvs3sfu5/lorago.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a48a40b9b---91329354849.pdfIn PDF document text
- http://kingsfinancialconsulting.com/userfiles/file/92433311243.pdfIn PDF document text
- http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/34803682940.pdfIn PDF document text
- http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/liteb.pdfIn PDF document text
- https://rimsball.com/ckfinder/userfiles/files/xavodujupenig.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e89cb4c5d---5541123106.pdfIn PDF document text
- http://www.urbanwaterways.info/files/79409904428.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9c9d481db---zobesajeg.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/da1e62cd2615eff94ad876af871d228b/60757183539.pdfIn PDF document text
- https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917b6a5da8b---87748027908.pdfIn PDF document text
- https://rubin2000-distribuitorshop.ro/userfiles/file/jizuniwijonibu.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/62ej7gdapfqifadmss0s1cac9e/11670796275.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd6dbceffe---furijuwaj.pdfIn PDF document text
- http://doremimarlikinsaat.com/userfiles/file/zoved.pdfIn PDF document text
- https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vr8ohkoh0a8q9v8em59v6blni8/jekurasixudar.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pastel+powerpoint+template+freePDF 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_off0000e5c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5C3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fdd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDD5	18784 bytes
SHA-256: `f3cd81efb5d492dcf457e1aecda1fed1d76034a9e0dcdca06c47f56651878de9`
`font_02_sfnt_off00012df9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DF9	10608 bytes
SHA-256: `6df370820f1df15220cc833d8de1db6919ca41908fb9ce1f58117ebc47a416f8`

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