PDF malware analysis — malicious · 241aa7cf36d2d408

MALICIOUS

PDF

89.0 KB Created: 2021-07-30 20:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6e773ccf51b183a4dddc53f5e77535a4 SHA-1: f3c8cdc299ab42a865606531a6737348db3db8b5 SHA-256: 241aa7cf36d2d4087fb173411d632e49bdce59970346dc64391a65cc76423a81

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://juraganmonyet.com/contents//files/22108122586.pdf In PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2d0afeaf---vopawagupubokunoxin.pdfIn PDF document text
- http://solyaris.pro/admin/ckfinder/userfiles/files/4892200738.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a57c264c---41675068801.pdfIn PDF document text
- http://screen.by/images/file/rejojododesaviwuji.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d69a96fa5---85666778669.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6835d7c56c9e8cafec9737ab8e1eff50/mololo.pdfIn PDF document text
- https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d68b97093fccd68c2b12a7bbee70d2f2/69023864389.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fe278bec---21385619878.pdfIn PDF document text
- https://www.lloydsunder30s.com/ckfinder/userfiles/files/95683586572.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5e2f004262b7a98167fa0e15d2903d5b/47985690765.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/l122ljonjng58h0qp2fg8ifjrk/wetuxexozarovik.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7c5f4e8adc870597750137f9db308328/30639539523.pdfIn PDF document text
- https://acgroupenterprise.com/userfiles/file/nuvavolikunaw.pdfIn PDF document text
- http://solar-makernavi.com/ckfinder/userfiles/files/66391052165.pdfIn PDF document text
- http://lpsa.cz/userfiles/file/94037329263.pdfIn PDF document text
- http://kiiga.ru/userfiles/file/botefatadagetosupusofa.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3d2a4f5---menitad.pdfIn PDF document text
- https://thehideawayresortpattaya.com/userfiles/files/4688048656.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/00044ceacdbb0b17543fc0a9a8ee0c78/89098333046.pdfIn PDF document text
- http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607447e9c86c7---54374073499.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1tt8eolo1sls4o894jc43oiq53/zunegojugegixalixawi.pdfIn PDF document text
- http://hamyarsanatco.com/ckfinder/userfiles/files/1847054226.pdfIn PDF document text
- http://guitarenko.fr/img/files/tofiwinowalibexiwib.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dc+unlocker+2+client+free+username+and+passwordPDF 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_off0000f619.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF619	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010e30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E30	11180 bytes
SHA-256: `acc96cc8d9d6b28e6a2dc83e5aece00e0633f4eb42da83817e8fa4d5bb56c475`
`font_02_sfnt_off00012882.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12882	17376 bytes
SHA-256: `b3125b4c2c570fff7098eb6d35aa703795657aa5706e5f6bfbdf800bda7d1bce`

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