PDF malware analysis — malicious · a557fad9c469395a

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 02:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 856fa1a8a1474858b2000427498a591d SHA-1: 2caaa26f3dc63521fefbcb4b8e3d6485a552b322 SHA-256: a557fad9c469395a432ca413922cb07d2f176dc547adee356844daa198bdf82c

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://smidgel.ru/uplcv?utm_term=4k+live+wallpaper+pc PDF link annotation
- http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kelafodoj.pdfIn PDF document text
- https://kratky.eu/files/file/dosugewesofoxi.pdfIn PDF document text
- http://indyztyle.com/ckfinder/userfiles/files/nukalolexa.pdfIn PDF document text
- http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6thv92fhoblqi38eieckps193l/numajutimewojojikodigin.pdfIn PDF document text
- https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/fozipobigesivuno.pdfIn PDF document text
- https://congtydaihai.com/upload/files/zirekibokin.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc55e152d4---pokewusifavo.pdfIn PDF document text
- http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/2712354901.pdfIn PDF document text
- https://civilkontroll.hu/uploads/file/dutitipemewuwalomu.pdfIn PDF document text
- http://ukonlinedirect.com/userfiles/files/jagixivas.pdfIn PDF document text
- http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/6465302689.pdfIn PDF document text
- http://seibyou-koujien.com/files/files/19571093855.pdfIn PDF document text
- http://hoanhaochemical.com/uploads/files/4088008602.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614424053c633---turot.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141187fd2eb5---vimanobozademoj.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132401616ed0---lerezawilupusimuzatepedo.pdfIn PDF document text
- https://h1t-url12shio-turbo.com/contents/files/60905603622.pdfIn PDF document text
- https://bela.geekers.tw/upload/file_folder/file/guvogobotomikaxeginop.pdfIn PDF document text
- http://velomagazin.hu/UserFiles/file/nizoral.pdfIn PDF document text
- http://beming.com/ressource/site-image/files/rutokudefigine.pdfIn PDF document text
- https://aicpwdosaeast.com/ckfinder/userfiles/files/50049282407.pdfIn PDF document text
- http://fbrasil.com/userfiles/file///56878334044.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_off0000ee7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE7E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010695.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10695	10100 bytes
SHA-256: `4d507a60f33d0bf1251338fc548054b88e3ae3d40e7cea97bedbd78a9edd9006`
`font_02_sfnt_off00011d47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D47	18176 bytes
SHA-256: `2e9f170fdd9870414721718c295b9c571cce3633c522cd1af658df8529cbca41`

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