PDF malware analysis — malicious · ab4e5cf79de27811

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 23:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 34bce0c70d701b5ba8778b57849507be SHA-1: 6e97f53691a16291e770c29df85a2a2797ad7e88 SHA-256: ab4e5cf79de27811b986372e134076bb4667060657e702be6b348305ef59f5ba

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://deeringbayrealestate.com/userfiles/files/21457394041.pdf In PDF document text
- https://www.confirmedtour.com/files/55187909609.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413375e429e---zetitami.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cedd31516---40042390851.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hluos0feh91h5t6cdvato1ge89/28385846552.pdfIn PDF document text
- https://baruipur.org/ckfinder/userfiles/files/varinetizub.pdfIn PDF document text
- http://modulobase.com/userfiles/file/3581999264.pdfIn PDF document text
- https://feltshoe.com/userfiles/file/xepokawe.pdfIn PDF document text
- http://www.saito-ken.jp/userdata/file/bibodosesirorug.pdfIn PDF document text
- http://suliaok.com/v15/Upload/file/20219101447575969.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f157a47e03---59418328556.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b65827b96d---rilufujevufif.pdfIn PDF document text
- http://pascalparrot.com/uploads/assets/file/78007569835.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/235d9b7ab470180bff7ddd2c47f5c7da/xafexaritepabavaviduku.pdfIn PDF document text
- http://aldobini.it/userfiles/files/savupojiwonumoju.pdfIn PDF document text
- http://stelmart.ru/userfiles/file/rifakotesukufukalaxomige.pdfIn PDF document text
- https://possamaiferramenta.it/uploads/file/25962841308.pdfIn PDF document text
- http://2222.netsociality.com/upload/files/4922013115.pdfIn PDF document text
- https://rougezenekar.hu/files/file/bojaf.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9413a200d022c50134ce3d657091f9ea/5856558987.pdfIn PDF document text
- http://wecans.net/_UploadFile/Images/file/mowufawopufigiti.pdfIn PDF document text
- http://ricettebiagi.it/uploads/assets/file/regujez.pdfIn PDF document text
- http://evevoyance.fr/adh/.-/file/waxisonuwuzusefibazulixen.pdfIn PDF document text
- https://khachsan295doson.vn/namthuan/images/news/files/95471480475.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/jukamolep.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=big+head+basketball+unblocked+gamesPDF 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_off0000ba71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA71	11100 bytes
SHA-256: `6946d00f3f2aeffa7ad51a58f2f8dbab706e1c8888b453c920e99907944294fa`
`font_01_sfnt_off0000d3fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3FB	16076 bytes
SHA-256: `50aa8b68bd4d0689772f2a08feb649968219064b76a64d5775d5b743c1886280`
`font_02_sfnt_off0000fd6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD6E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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