PDF malware analysis — malicious · 5ebd8e788e1dced7

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 19:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 051daf3e7c59be45afa811612ebe044d SHA-1: d55e4498d9036048452f73b192208205b61b47e8 SHA-256: 5ebd8e788e1dced7c2cf2a07a0beefd2bff7c85a4c9932a93ec159c9c3f3e05d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with multiple URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://siroyensao.com/upload/files/6496926874.pdf In PDF document text
- http://bakefruit.com/uploads/files/202109082150095701.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630465214.pdfIn PDF document text
- http://www.stadion-zarya.ru/ckfinder/userfiles/files/32237401362.pdfIn PDF document text
- http://boki.hu/editor_up/37461221891.pdfIn PDF document text
- https://rtvpuls.com/ckfinder/userfiles/files/8310271443.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/039de5afd613d70feee65872369c1dba/gibixejera.pdfIn PDF document text
- http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a61ba492b---21304044536.pdfIn PDF document text
- http://yejida.com/userfiles/file/zabivalubolejimepu.pdfIn PDF document text
- http://cerritos.songhakbbq.com/uploads/files/junotila.pdfIn PDF document text
- http://manenshop.com/upload/files/79644692687.pdfIn PDF document text
- https://nbcmedia.vn/ckfinder/userfiles/files/23807491068.pdfIn PDF document text
- http://agisma.ru/files/pages/files/tefabude.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/759930fa5d26d746befd44d0ec62fbde/71369159856.pdfIn PDF document text
- http://travelci.ru/ckfinder/userfiles/files/felonibe.pdfIn PDF document text
- http://sutinlawkrabi.com/ckfinder/userfiles/files/19090026958.pdfIn PDF document text
- https://shen-su.eu/gfx/userfiles/files/kekirafidajopinijikiponi.pdfIn PDF document text
- https://mamadona.ru/ckfinder/userfiles/files/jaxipofuwixawukixiwut.pdfIn PDF document text
- http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
- http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ratafabivow.pdfIn PDF document text
- http://asbu.net/uploads/FCK_files/file/zegirazekuvigub.pdfIn PDF document text
- http://sm300159.agchost.com/userfiles/files/rutekivafatelepawejuk.pdfIn PDF document text
- http://etkenkalip.com/files/98813228747.pdfIn PDF document text
- http://knx-shop.ru/admin/ckfinder/userfiles/files/wojubomazuji.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e67f91c89---11157975399.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dj+songs+download+malayalamPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000cdb1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCDB1	18220 bytes
SHA-256: `59ed995dd4e2e19aa3339d2b2696749ae3776be666fbca89fca4d00f1e8837e1`
`font_01_sfnt_off0000ea61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA61	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010273.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10273	16908 bytes
SHA-256: `0901f06909a24404db45893825dd9b7ae25b96c6018ec94e2b822c6603140671`
`font_03_sfnt_off00012e7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E7D	10500 bytes
SHA-256: `ef7f052f62287caca4eb8adf41f1b303758d732d1ef6942d3c5b377621ee23fe`

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