PDF malware analysis — malicious · 5e22c1cd6ab70aba

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 16:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8dc5bdbc0025a21b5c7b3fdb7ef64150 SHA-1: b1797ce935c1fc1a85974680601d4f7f51b9ffd7 SHA-256: 5e22c1cd6ab70aba129b2309a25ab05d9e7124b041d45d2b5dc36d7bf4f5bcc8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters points towards a coordinated effort to lure victims.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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 https://smidgel.ru/uplcv?utm_term=creasy+springs+lafayette+in PDF link annotation
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110bcc7a3967---38267091223.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088577e8da7e---74772273209.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aea39de9384a4df1a6622521bf9eb7fe/gopopepew.pdfIn PDF document text
- https://angelsstaff.com/uploads/file/56978902079.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4176e74e4---rajiluxivakevufigev.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/r47t8bdopth5ce0g1fj7c600m0/tomute.pdfIn PDF document text
- http://toyotalongbien.org/data/dulieu/files/7624881053.pdfIn PDF document text
- http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93c89c334---67982328912.pdfIn PDF document text
- http://soldearenales.com/galeria/files/77134861894.pdfIn PDF document text
- http://starwindows.ie/ckfinder/userfiles/files/85767955608.pdfIn PDF document text
- http://kerekesvillszer.hu/UserFiles/file/gawasekadezefirolep.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57c96c3f5---1644999720.pdfIn PDF document text
- http://toicodonlyson.com/uploads/files/nakavexazo.pdfIn PDF document text
- http://delshadian.com/public/userfiles/file/rifetuzurirowaxebefib.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e8ecbf5e40392bc9b2b1031ff69c971e/sosunadukafub.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0592aaf1d---58668879493.pdfIn PDF document text
- http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af452b81---bajabajukumujunif.pdfIn PDF document text
- https://tomorrowhubs.com/upload/users/files/wofitaxilejaluzupageza.pdfIn PDF document text
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2bqf9732165vkn9q2v8fmpveia/3949212589.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210530203410219976886.pdfIn PDF document text
- http://www.musicboxpiano.com/contentfiles/sipolawepulon.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609149f574502---46850140791.pdfIn PDF document text
- http://namthangbasaltstone.com/uploads/image/files/mazikirop.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_off0000bff2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBFF2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d809.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD809	10556 bytes
SHA-256: `d7bb7d4f4d735d83850880716279060b58a55c5ebd876735de23a417135ee67e`
`font_02_sfnt_off0000f044.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF044	16832 bytes
SHA-256: `04dc9dcc1e2484e943c6624c7f09a1cc5499058be3c7a21ccdd77011869fe5fe`

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