PDF malware analysis — malicious · c05912e49737fa8c

MALICIOUS

PDF

75.1 KB Created: 2021-09-26 16:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 70fe13bd7fb0b3afa0fc79a105fe2fac SHA-1: 750a02245e177386bd85e42bf733c2c423ede2d2 SHA-256: c05912e49737fa8c9d24bef103bd1aa59f233415afc35b81db7d5c6c575d8525

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of numerous URLs and the PDF_URI heuristic strongly suggest the document's primary purpose is to redirect users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=hopstop+android+app PDF link annotation
- http://lindendirect.com/ckfinder/userfiles/files/79521626923.pdfIn PDF document text
- http://sirinthepgroup.com/userfiles/file/waxadejo.pdfIn PDF document text
- http://fanta-life.com/userfiles/file/77716828085.pdfIn PDF document text
- http://konberdbio.com/upload/files/zodonivawadedada.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5mbun5jmm5373mpjv6654vc2eh/67330916950.pdfIn PDF document text
- https://invision.buzyhub.com/files/46165329834.pdfIn PDF document text
- http://esteel.my/userfiles/file/76984640025.pdfIn PDF document text
- https://z87992961.com/upload/files/20210922154200.pdfIn PDF document text
- https://ego-sofa.tw/uploads/files/202109080159136862.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313189526b---rawafewaxoxefuvabesobix.pdfIn PDF document text
- http://claudiamelchior.it/images/file/ziripuxivulud.pdfIn PDF document text
- https://braindevelopmentmaps.org/userfiles/files/5289460914.pdfIn PDF document text
- http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/nijojetikipi.pdfIn PDF document text
- http://upnbkk.com/file_media/file_image/file/dimoxejera.pdfIn PDF document text
- https://tomaszbizon.tomaszbizon.pl/web/uploads/files/7573525317.pdfIn PDF document text
- http://smingames.com/ckfinder/files/jibufisowugilegomagisexuw.pdfIn PDF document text
- http://tbeaindia.com/userfiles/file/gozazujipazavabamu.pdfIn PDF document text
- http://amsuatrust.org/survey/userfiles/files/monatumifideligamizun.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f60f914aa5---togetakezomi.pdfIn PDF document text
- https://stopserv.ru/files/file/budamobezilexili.pdfIn PDF document text
- http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/23520384034.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1ea875855---29134820813.pdfIn PDF document text
- https://datxeninhbinh.com/data/dulieu/files/keduguwisomanovakoxori.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/novakunopiba.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_off0000bcfe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBCFE	19012 bytes
SHA-256: `86ef1b8c354ecfef5a3dd5a122ef7fea1925f27f54d864152affd907b1967f72`
`font_01_sfnt_off0000ee77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001068e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1068E	10200 bytes
SHA-256: `e0841853fc598ba1dd7308cc6a9d2e19134a095231667189ed06ff4eccc59e3c`

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