PDF malware analysis — malicious · 50cd6342893a9b3c

MALICIOUS

PDF

87.9 KB Created: 2021-07-05 20:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 5eb97e9c1621a2034b218769a9d375f3 SHA-1: fe7b191a677af333c92d21f35edfd524bb9e6e7f SHA-256: 50cd6342893a9b3c78cbd1df628eae62369ca31de98e1496568f0675f49a6b66

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=importance+of+internal+control+in+auditing+pdf PDF link annotation
- http://ayurveda-shiatsu-qigong-nice.com/upload/files/jukarim.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ldl1nh2v9gg7p42rv1okneqjio/41155288148.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6a3e9d009b8a06510376fcab5cbb6080/zizizuxalomebivusu.pdfIn PDF document text
- http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0498254f---sepedolukiniz.pdfIn PDF document text
- http://cbgnfinance.com/userfiles/file/21298037867.pdfIn PDF document text
- http://eurekaelearning.com/upload/news/file/22569153807.pdfIn PDF document text
- https://cafepiolho.com/uploads/assets/ralevajigavowalapise.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/932e48173a41f910f891d8b0dc63eb93/nuvotot.pdfIn PDF document text
- https://eminenceconstruction.ca/viking1/uploads/files/71437275246.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ble518ig80rmub6b4itklcjbj2/29319685057.pdfIn PDF document text
- https://nanyangtextile.com/userfiles/file/76541230188.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607545669bae6---75712521575.pdfIn PDF document text
- https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/931d0dbfed53231dfb6d512cf169d283/vijogaka.pdfIn PDF document text
- http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b18426391b9---wijexudejago.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075849824dd6---17671335979.pdfIn PDF document text
- https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b72badc15---tifuvokolepajut.pdfIn PDF document text
- http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdea6ae77b---31110377784.pdfIn PDF document text
- https://shidoremicrosys.com/media/69607223672.pdfIn PDF document text
- https://cbconsulting112.ca/userfiles/files/lomugufapox.pdfIn PDF document text
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/au7gtdilh3b4cpdvkaouq6qch1/kubopi.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d30c3045f---buwexesoridurazilipanid.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768fb90c393---bufis.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/flmdfr4ssh23tdqum8obju76ib/94553214577.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc3af3262---nitonaz.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ce63129d00ab34ff452ffb08c6e556a7/puvix.pdfIn PDF document text
- http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/17165190797.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_off0000f3fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3FB	17460 bytes
SHA-256: `93196151fdf771cfa83efcf164ed0e5c1ccfc1bddd79b78e58ade47edb8edc4a`
`font_01_sfnt_off00012158.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12158	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001396f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1396F	10848 bytes
SHA-256: `d0aa61ca0c748a9ff8d9a330109986696f1fc8cfd1c0dc1b60ce6e1d940c656f`

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