PDF malware analysis — malicious · 20f31d0164bf4d96

MALICIOUS

PDF

80.2 KB Created: 2021-09-06 00:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: fd9122f74cc833f1ef2e5b1ebf6dc7a2 SHA-1: 68c70b82080789cc062f218adaeed7c0e56ee073 SHA-256: 20f31d0164bf4d96ad8f56191ac2ac7cab006b3a4cbeab8df837a36fb356d9b3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to distribute phishing content or further malware. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://rrr71.ru/upload_picture/36589329927.pdf In PDF document text
- https://raiporjai.com/piceditor/file/linid.pdfIn PDF document text
- https://gruntbudowa.pl/files/file/82140692433.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hrifj3g8a29j7758jbsb8lb0li/90796967140.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b8fecbf6b81666f18db452c407ff2d34/75831386199.pdfIn PDF document text
- https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/12126091525.pdfIn PDF document text
- https://metal-et-verre.ch/ckfinder/userfiles/files/38836637160.pdfIn PDF document text
- http://msamericapageant.com/clients/873634/File/woxoperukesuf.pdfIn PDF document text
- http://cukierniabrzezinski.pl/www/artizam/fck/file/65219034709.pdfIn PDF document text
- https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/00212aceb21c71506058edef67d41584/vigipepoxuxeve.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aacaa6131---2092804681.pdfIn PDF document text
- https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/96kq528prdl4c9ad86o1615qkb/6419686412.pdfIn PDF document text
- http://ohappy.org/userData/board/file/88653085962.pdfIn PDF document text
- http://mfcwestenkwartier.nl/beta/userfiles/file/1269247096.pdfIn PDF document text
- http://pogservice.ru/userfiles/file/35115721216.pdfIn PDF document text
- http://congtydaihai.com/upload/files/81555231686.pdfIn PDF document text
- https://kaptenhoki.net/contents//files/sugujodideb.pdfIn PDF document text
- http://orchid-daikanyama.com/userfiles/file/86241600488.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/xoputapinus.pdfIn PDF document text
- http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/konuwugodetudupi.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/26e47b7bd7287a2ee6c5dfa2d08ba71c/futotadiworobebakez.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d2298e28---18681186679.pdfIn PDF document text
- http://enricobarraco.com/files/51451378853.pdfIn PDF document text
- http://kondicionery-ivanteevka.ru/upload_picture/file/75140541311.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=let+it+go+piano+pdf+advancedPDF 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_off0000d73b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD73B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ef4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF4D	17144 bytes
SHA-256: `394a130a5f1f75b4b8606d41343ffcb030be61facb152c4ef420357892fcad95`
`font_02_sfnt_off00011b0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B0A	10504 bytes
SHA-256: `a6dc2a4151d23f7346115d93144f6412f35c1a183c77a0240b39c75981142f62`

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