PDF malware analysis — malicious · ef4650b76ffd153f

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 00:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6f5f40f4931889b0f70c34f994404c91 SHA-1: db6cd5e585ae5eebf3f1ffd8341896149d3d3484 SHA-256: ef4650b76ffd153f016f123d4be42d021a4cbdb9a9ec8e2b69002e26f6b63cec

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on potentially compromised or disposable domains. The presence of 'utm_term=super+suit+mod+apk+unlimited+money' in one URL suggests a lure for potentially unwanted software or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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 http://shangyi-pump.com/uploads/file/081111135204.pdf In PDF document text
- http://laserbeautymachine.net/d/files/25897189018.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6f074d179e44d005081b1a3e0b7f0119/46319490771.pdfIn PDF document text
- http://recrute.fr/files/files/xotewewojetekijadakakeja.pdfIn PDF document text
- https://cosmopolitanhotel.eu/uploads/wysiwyg/files/baxejajujepuguregolo.pdfIn PDF document text
- http://thuocamakong.net/userfiles/image/file/67135870240.pdfIn PDF document text
- https://nergizleryapi.com/image/files/93185744239.pdfIn PDF document text
- http://plncse.hu/php_data/file/dujikusekuzirejozaxuk.pdfIn PDF document text
- http://pm-ural.com/uploads/files/sevudoveresogavepaw.pdfIn PDF document text
- http://rem-stroymont.ru/img/file/32248597557.pdfIn PDF document text
- http://abhinavabhishad.org/userfiles/file/36154791189.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ffbf1e521cb5327dbc532d45dd6544b2/dadasitavi.pdfIn PDF document text
- http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufizux.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohcuctnne1845uo9kucaqr8q8r/pajebirekotexatiluzamas.pdfIn PDF document text
- http://wccflooring.com/userfiles/files/15361959987.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/97309498373d78064f04e6f1a6777426/57613695077.pdfIn PDF document text
- http://weddingdove.tw/uploads/files/202109190918453493.pdfIn PDF document text
- https://mayphotocopydogia.com/upload/files/89270643322.pdfIn PDF document text
- http://decorstore.eu/upload/file/5966260677.pdfIn PDF document text
- http://say-international.eu/userfiles/file/37687626792.pdfIn PDF document text
- http://soles2walk.com/data/file/simivomabamekefifekafe.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161412bed603c9---73595250187.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c42ca241aeb61dfb5d79386cb7d5368a/pepur.pdfIn PDF document text
- https://farmaciasacoor.com/site/upload/file/vuxedevid.pdfIn PDF document text
- http://www.coverseg.com/uploads/ckfinder/files/gizarin.pdfIn PDF document text
- https://cmfnepal.org/userfiles/files/xakujibobebarubadilodu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=super+suit+mod+apk+unlimited+moneyPDF 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_off0000b7ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7AD	16568 bytes
SHA-256: `26331e07f06bf144c351bedfb2772895997b4efa3e98fdb323346bc0cb94b018`
`font_01_sfnt_off0000e25b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE25B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fa72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA72	10936 bytes
SHA-256: `088d0dbaa810ca0c3de0e3a2335d7c01927c7c3fcbd44c119da16ddba45f6428`

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