PDF malware analysis — malicious · 37ffdef184045431

MALICIOUS

PDF

89.8 KB Created: 2021-08-16 18:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: cd2efd05abce640128c6ca31d2ba5129 SHA-1: fb4384039c0ef72dd9172755677222494076c348 SHA-256: 37ffdef1840454313295d74e46cc2684ea697503fd8b9125029f9c870d7bc883

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=adobe+photoshop+cs6+tutorial+for+beginners+%28part+1%29 PDF link annotation
- http://mynigaoe.com/upload/file/20210605094144.pdfIn PDF document text
- http://plnjl.com/userfiles/files/kizuvewogozezekug.pdfIn PDF document text
- http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609202655aaf3---84001410775.pdfIn PDF document text
- http://ever0036.com/assets/uploads/ckedit/files/20210529111251.pdfIn PDF document text
- http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c522ca11337---76908449834.pdfIn PDF document text
- https://nepalonetours.com/userfiles/files/jinezeja.pdfIn PDF document text
- https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/o485eaj0dodsmoa3cjssc2ubp6/kurinapuwigiwu.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/05916ba574f29f59e086e089e1ac1f9f/4394048442.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092caf19d4ab---70409751997.pdfIn PDF document text
- http://dh-cell.com/ckfinder/userfiles/files/40396236677.pdfIn PDF document text
- https://dineflon.com//files/fenemoxumo.pdfIn PDF document text
- http://matsonconstruction.net/userfiles/file/xuxejigitumagoriwove.pdfIn PDF document text
- http://rockpapersun.com/upload_mce_image/file/81151389305.pdfIn PDF document text
- http://barcabianca.eu/upload/file/basusuxogilabomuj.pdfIn PDF document text
- https://locoffice.ru/userfiles/file/pakosobeta.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1ed5de4eb44c530687e3b2af23ed6883/75846589629.pdfIn PDF document text
- http://enjoybowlramenandpoke.com/uploads/files/sudetedegeto.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b8ef138da2e456f526d6f0b115697193/11905087924.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f4df3362---lorumarum.pdfIn PDF document text
- http://cameragiaminh.com/upload/files/kuzepugazowaforikawunozo.pdfIn PDF document text
- https://aradovan.com/userfiles/file/vuriwafurowafimemefarike.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8bdcba433---xibodidujomovesafula.pdfIn PDF document text
- http://massarentearchitettura.com/userfiles/files/11184803131.pdfIn PDF document text
- https://sporyolu.com/resimler/files/77476531405.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_off0000f876.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF876	11496 bytes
SHA-256: `5f4457ab3f1080c0bcf19264a5cfe2b0cf696fdaef70e07943f55cae79e366fd`
`font_01_sfnt_off00011358.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11358	17380 bytes
SHA-256: `2529814f81a5cdbc18d109584cb7d0e5dbee19420d3413a7365a027eda4c2bd7`
`font_02_sfnt_off00014062.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14062	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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