PDF malware analysis — malicious · 78236669e9070fba

MALICIOUS

PDF

71.3 KB Created: 2021-09-04 19:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 142d53ad9d792137110c979da1a8146b SHA-1: 220f0fa121781374bd151172dc6b5753870f4923 SHA-256: 78236669e9070fba1b750f55fc909baf2b6ae77c23444fccb6109cda7965461a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to lure users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a malicious intent to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df23aef2aa---1277548303.pdf In PDF document text
- https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/67410446958.pdfIn PDF document text
- http://mynigaoe.com/upload/file/20210531210537.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c345d157---voxevovexedej.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/225c4c33017a1cbb0b385088933736de/xofadiveredeguginafeg.pdfIn PDF document text
- http://gsxr.hu/userfiles/file/bogarulexa.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7dc8c524bb8807c5305ae4ddf17ab87e/faxikajogimakirojavabab.pdfIn PDF document text
- https://rosycaffe.com/file/11892122712.pdfIn PDF document text
- http://archi1919.com/smlclub-files/file/85853261192.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e160212f29c---nejodosuzevavemu.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/v61bcgengm1itjoeut0qb9n107/82524274502.pdfIn PDF document text
- https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/345a6efa7935301a29461faed06bc6ef/66033571802.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1865649544---3977862126.pdfIn PDF document text
- http://suriyedostlukdernegi.org/image/files/besodepenazur.pdfIn PDF document text
- http://divodizain.ru/ckfinder/userfiles/files/77986353943.pdfIn PDF document text
- https://instalacje-elektryczne.net/ckfinder/userfiles/files/83545400986.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119ea1b12bc5---50874441139.pdfIn PDF document text
- http://dentalweek.eu/userfiles/files/kilikaxixujigeviketebefoj.pdfIn PDF document text
- https://peptidturkiye.com/ckfinder/userfiles/files/90429260954.pdfIn PDF document text
- http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f40e1731---teberiwosalujed.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d039e90d2329c8e6bf8c9eddd9179272/dedokegole.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/68405601320.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/2513591059.pdfIn PDF document text
- https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/7555949664.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbe46d9bb---57067127004.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=assessment+procedures+for+counselors+and+helping+professionals+7th+edition+pdfPDF 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_off0000b67b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB67B	15080 bytes
SHA-256: `6af35b3dd1a14e80da4f0efb63e200eb55d898ca6fb48560e7706f5feb1b2fa0`
`font_01_sfnt_off0000dc7f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC7F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f496.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF496	11196 bytes
SHA-256: `2ea71241e00566ecd7b235b8bf502e7a62ae7896e609e7a0e5281aaba6e3f28b`

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