PDF malware analysis — malicious · 5bfd9e8ad2aa92ac

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 12:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: b1a78edbeb0b54b17df14e6fad961a26 SHA-1: bf02f5e477f4b3d6918b47fdedfdab15557272e9 SHA-256: 5bfd9e8ad2aa92aceeb84b007199ffe9029c30f962c4cee3e659becaa2bbef7e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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 https://chcial.ru/uplcv?utm_term=greek+gods+and+goddesses+pdf PDF link annotation
- http://urparitet.ru/admin/ckfinder/userfiles/files/4999956340.pdfIn PDF document text
- http://sevennews.com.br/ckfinder/userfiles/files/xawufiseja.pdfIn PDF document text
- https://wanfutemple.urwaydesign.com/data/file/userfiles/files/zulidakurek.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138052089add---zomavijumuwibug.pdfIn PDF document text
- http://gopherandsquirrelcontrol.com/admin/images/file/xesop.pdfIn PDF document text
- http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
- https://loonbedrijfschimmel.nl/userfiles/files/kefafezagozelukumobikodum.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ogl3i9b5arb9jakuihga6bhqs6/nepijiduzilu.pdfIn PDF document text
- https://thietkeweblongan.com/upload/files/rominobubetufobi.pdfIn PDF document text
- https://scalping.ir/data/files/file/50854620606.pdfIn PDF document text
- http://sibzakon.ru/ckfinder/userfiles/files/35809146752.pdfIn PDF document text
- http://mrs-edu.com/sribati/editor/uploadfiles/92744180004.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9745e47cc---tiwosozerubejipofagip.pdfIn PDF document text
- http://www.agenbenangbandung.net/file/petowixaxujijafobesubufi.pdfIn PDF document text
- http://abwwilson.com/uploads/files/kekobofijesobitak.pdfIn PDF document text
- http://ip-golubev.ru/ckfinder/userfiles/files/33421216161.pdfIn PDF document text
- http://sanitaerprofi.ch/fckeditor/editor/images/file/9502550398.pdfIn PDF document text
- https://sdudyogtechnologies.in/ckfinder/userfiles/files/11894920218.pdfIn PDF document text
- http://thaiboxes.com/piceditor/file/viduwititudame.pdfIn PDF document text
- http://cyc.cz/pictures/clanky/files/zoxuxenekulofena.pdfIn PDF document text
- https://optimumquestsolutions.com/ckfinder/userfiles/files/regadamedemulibumite.pdfIn PDF document text
- http://hidramaco.com/files/files/wudotizokupufogobaletid.pdfIn PDF document text
- http://kingbikeonline.com/images/upload/File/53775036525.pdfIn PDF document text
- https://daqing-jewelry.com/uploads/files/202109121928505545.pdfIn PDF document text
- http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/13001972402.pdfIn PDF document text
- https://mps-india.com/userfiles/files/sorajo.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/rigIn 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
`font_00_sfnt_off0000c149.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC149	17076 bytes
SHA-256: `b3760dd988e98edbcdd4ffbcdbef18471a8dd9ffba166d8b9ccc16d219e5b095`
`font_01_sfnt_off0000ecc8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC8	10568 bytes
SHA-256: `a278d271e34d87fa1715e5da1219baecabeaaaee2c5cfb58ebadc59d5538f2b0`
`font_02_sfnt_off000104cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104CD	18464 bytes
SHA-256: `d8c3d7c749a88ed482abf6c024e8c184e5fcfab46df6da8f2eb72b337c3feea9`
`font_03_sfnt_off000121fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121FA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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