PDF malware analysis — malicious · 655a20422c241222

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 02:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4d069c3aac9bb0d81f94de867423520a SHA-1: e403ac5114eb26918a23ac58dbfef4d938061491 SHA-256: 655a20422c24122242076196b3b231cf6527ad84eecb1548e0de8c579b4d3e86

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 CMS upload storage, indicating a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=untold+legends+android PDF link annotation
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd8f8a378---kunokefomebixerotexot.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/gegefikufixarutomabas.pdfIn PDF document text
- http://hidropro.hu/upload/zinalu.pdfIn PDF document text
- http://njuhome.pl/ckfinder/userfiles/files/7355660317.pdfIn PDF document text
- https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/61550719889.pdfIn PDF document text
- https://www.ebenisterie-burette.com/ckfinder/userfiles/files/zogulur.pdfIn PDF document text
- https://brahmagnanam.org/fck_uploads/file/nolobifofunivimebunoti.pdfIn PDF document text
- http://kidsjeodo.com/images/files/30296715509.pdfIn PDF document text
- http://jjsgreatescape.com/uploaded_files/userfiles/files/wapetavakozu.pdfIn PDF document text
- http://librojuridico.com/aym_images/files/13833921093.pdfIn PDF document text
- https://livewireeventz.com/userfiles/file/wenibewibotog.pdfIn PDF document text
- https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/ropizinuxijifozawox.pdfIn PDF document text
- http://dexgerm.com/data/file/userfiles/files/47836432152.pdfIn PDF document text
- http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gurubuvoxaxi.pdfIn PDF document text
- http://aaas.handyfriendship.com/upload/files/89462222132.pdfIn PDF document text
- http://mya1fc.com/files/ckuploads/files/4894454863.pdfIn PDF document text
- http://mistral-paints.cz/userfiles/files/60205216692.pdfIn PDF document text
- http://machin.kr/userData/board/file/doluvakudomovikagakoro.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce0715448---xoxifalegemaputenuled.pdfIn PDF document text
- http://chipgene.com/image/files/20210902_192438.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320d80e1703---35436557719.pdfIn PDF document text
- https://dukeofmarshall.com/ckfinder/userfiles/files/zarufijawobogebuverufu.pdfIn PDF document text
- http://galenbio.com/images/upload/file/vokuxogojolelusozaxi.pdfIn PDF document text
- https://net-mex.hu/ckfinder/userfiles/files/7950143932.pdfIn PDF document text
- http://studiotecnicopetrillo.eu/userfiles/files/xewifu.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_off0000efaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFAF	10432 bytes
SHA-256: `72ea982fb3f19663fd72644a0fb8b9e8d8febda6d2d689c9655516c3d019bcc6`
`font_01_sfnt_off00010739.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10739	17588 bytes
SHA-256: `7f753ae198f4c6271c0bac0191033f69b0d472d288a058eae56f369283aceab0`
`font_02_sfnt_off000134d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134D1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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