PDF malware analysis — malicious · 09f5358fc8f17e56

MALICIOUS

PDF

104.8 KB Created: 2021-06-28 00:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: e8c6c26132e2472c05f1bd39cd7e2d6c SHA-1: af5b10fe31f8ec67f2aaa811fac4a1f7f3c48734 SHA-256: 09f5358fc8f17e56642ebd8f062e461b94ed32c668bbb1658ea75fd1485b9cbd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. The presence of numerous unknown URLs hosted on potentially disposable domains further supports a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9773

Heuristics 6

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.
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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/o9cdkcck1cqft4q6kfgu62hdlp/vuzeribofarafu.pdf In PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4895ea0a1---lujomiv.pdfIn PDF document text
- https://akapacha.com/userfiles/file/21557259550.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/be7f9a6160f93b4a2a4d961a180a509d/57531340400.pdfIn PDF document text
- https://aterhesseg.com/up_image/file/zilakolij.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/55gl7vu31pngvte0ubkn6qqtvo/minizisupa.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d4c8b91c41485fbe1fc389e22d6ac306/pasufeboliriwiw.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608258ec6a724---tukolelepo.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879ae55b40---13102214142.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c79838dd---75344903116.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6efc6a634---55086705750.pdfIn PDF document text
- https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea4371fdd---xadoguxe.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2826058da---27022934575.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f431d9fbfe---tesonotekopevuwenon.pdfIn PDF document text
- https://leuphuotcamap.com/uploads/image/files/kujodalik.pdfIn PDF document text
- http://fincasotilloviejo.es/files/sotillo/_repo/file/70566456997.pdfIn PDF document text
- http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/4095336288.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/db734081d5008bf1fb5c5aa60716e773/91799904761.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/07d79156a134faecd5fd34d62babd260/bitivopat.pdfIn PDF document text
- http://tscyw.net/userfiles/file/20210626184754_g3n5eg.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160841a9d4827c---11929659922.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe04a43c2---95322296672.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d7cc77cf---gizijo.pdfIn PDF document text
- http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783dc55ab4f---34312529056.pdfIn PDF document text
- http://xn--dlek-5qa.com/admin/UserFiles/file/18008118230.pdfIn PDF document text
- https://telewebmarketing.com/FCKeditor/file/67480984231.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/870e267ead67720b13383e02d6131422/wowiwomabofixur.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=white+daisy+flower+meaningPDF 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_off0001375e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1375E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00014f70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14F70	17448 bytes
SHA-256: `9697fc2b6463dc3b8c5fb434d0fbf3d62f7521d9fb5dfb7fe9592e2b7b757200`
`font_02_sfnt_off00017c8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17C8B	10992 bytes
SHA-256: `320fbaa8e53754d70eb22b123fd6c8cdbc8ac342fddba9fe47b5f109007bb764`

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