PDF malware analysis — malicious · 77fcfb1971b38248

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 17:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6f9dd94b64f166709adef39040e5a5b5 SHA-1: 47a6a7bade97a05d67889269f415141345fa6bf0 SHA-256: 77fcfb1971b38248bd471316c24faac302300e392ee92b6d049889a206075c5f

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains an embedded JavaScript stream and a large number of external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a phishing or malware distribution attempt. The primary purpose appears to be directing users to malicious content via these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9762

Heuristics 7

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.
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 http://dwornawodzie.pl/userfiles/file/48698142029.pdf In PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/24632a092ce73ada95e9e4a566d77eb6/sofixumuwisibijomoko.pdfIn PDF document text
- https://agentcctv.com/userfiles/file/65435340607.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3b843ae957b988a5fdf9ccf7484c525f/93960351572.pdfIn PDF document text
- https://termofriz.rs//files/vopesikokajibepudelezal.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2be5a5e9e9---bikakiveramanezub.pdfIn PDF document text
- http://www.hydro-tg.pro/upload/file/84002039491.pdfIn PDF document text
- http://konferencii.org/js/ckfinder/userfiles/files/85642118591.pdfIn PDF document text
- http://amadpich.com/userfiles/file/lavox.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/91c2o9mbra49p76kp5g705o007/kuvatejitufosibadi.pdfIn PDF document text
- http://finemetal-cn.com/upload/files/95021260911.pdfIn PDF document text
- https://areopag.ru/sites/default/files/uploads/lizuxuragusegowugolimi.pdfIn PDF document text
- http://richmediahouse.com/admin/uploads/file/kiban.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b711e03e09b---23716346329.pdfIn PDF document text
- https://medbillings.us/lightspeedweb1/file/bogob.pdfIn PDF document text
- http://lamekatus.ee/uploads/ckeditor/files/15216902829.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55a857bc6---nudabufodaselipesumigepe.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/godakubefaj.pdfIn PDF document text
- http://cdseoulps.com/uploadfile/fckeditor/file/50017647326.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/72714498586.pdfIn PDF document text
- https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f3fbc27a08c2dde5fd18202884cdc293/78190254914.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/s068t2imk8oqnhst2j9hk0m6qe/53079450272.pdfIn PDF document text
- https://izr.fr/files/28163172006.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/bojufe.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/210d5bd86e184fc79c29ea0f211bfb4a/26490735357.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4402d449d---nufab.pdfIn PDF document text
- http://dalnoboy.net/data/filestorage/upload/files/21821693034.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=idioms+for+everyday+use+answer+key+pdfPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c9df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9DF	19696 bytes
SHA-256: `28c85090306f5e1c3538f5c75d0737e4e163dd85ac099e90599525fa83fceb55`
`font_01_sfnt_off0000fcda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCDA	10924 bytes
SHA-256: `4df2ed04d1d536a6e78323f0e6154c556db9f37cbe49cad9c5cc4ce857625bbe`
`font_02_sfnt_off0001163d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1163D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00012e4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E4E	16244 bytes
SHA-256: `fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d`

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