PDF malware analysis — malicious · f77e327752a1f44e

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 01:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 74db23c97877f19140d7f0b945db857f SHA-1: d7f4dfc83e4a3d8932f1504205c34c154b6d6a98 SHA-256: f77e327752a1f44e3c6d4384abb057788bfee16ab8d9d528e8b687e3a615f42e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. Several URLs point to compromised WordPress sites and link farms, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to execute malicious actions or redirect the user to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://huntic.ru/uplcv?utm_term=javascript+search+pdf+for+text PDF link annotation
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0i92o4pk82aesccvg94877s60/wubarororezojizozakav.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160985ec8eb8da---32135964538.pdfIn PDF document text
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/n8g6qtjpovacvnlb6kpiica5lr/16845450455.pdfIn PDF document text
- https://plasy.com/uploads/file/bugirosisotemonubopuw.pdfIn PDF document text
- http://modellszerviz.hu/userfiles/file/271284963.pdfIn PDF document text
- http://dailyliving.nl/ckfinder/userfiles/files/zosij.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4e0be66a---gasuduziguriraxeladumil.pdfIn PDF document text
- http://baocaosuhoatoc.com/luutru/files/teludizirejutezizim.pdfIn PDF document text
- http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdfIn PDF document text
- https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ef7946dfa0c6025271e9cfb68e3e71d3/27817598312.pdfIn PDF document text
- https://jakspravnenapsa.cz/userfiles/file/12567236728.pdfIn PDF document text
- http://vitalenzyme.com/uploads/fckupload/file/muzudumob.pdfIn PDF document text
- http://katachizu.com/img/news/files/xitumokifereba.pdfIn PDF document text
- http://wasserburg.pl/userfiles/file/moxapedukoma.pdfIn PDF document text
- http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/romizekuxumasarelebojix.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b102300dd9b---kaduwotiwavabo.pdfIn PDF document text
- https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/ic9k8k92vk3125687iq625180v/tifedud.pdfIn PDF document text
- https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c7915974c8237500c0929b5be1e0efb7/49368404922.pdfIn PDF document text
- http://baugeraeteverleih.de/benutzerdateien/duwojito.pdfIn PDF document text
- https://catbasailing.com/upload/fck/file/rulatudejuxinew.pdfIn PDF document text
- http://hyosangjo.com/userfiles/file/20210624110444.pdfIn PDF document text
- https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/aqfb9uk8s671763vgr1560rt13/37174674868.pdfIn PDF document text
- https://jairdefreitas.com/ckfinder/userfiles/files/bitazawabixogi.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b34fa9a7b---22306030734.pdfIn PDF document text
- http://webdulich.com/js/ckfinder/userfiles/files/84843692273.pdfIn PDF document text
- http://worthingtonpark101.com/userimages/tibunexewuxerasigefilem.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_off0000f7ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7FF	10724 bytes
SHA-256: `daeb51d76515356327375c0476c7ca1d63410426ae6192737345a19f48ca4f9d`
`font_01_sfnt_off000110ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110CE	18968 bytes
SHA-256: `9b24b5c909cb3efeb32ddfb5449d85818718fffb4a3f823668b0ceb8f736f7ad`
`font_02_sfnt_off000142ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142FF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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