PDF malware analysis — malicious · e57cf175f95b922d

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 16:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f585f990aab8f0ab72aaed2222a05ad0 SHA-1: 1a9950ee062751dff626c1ded94a9057650c6e4f SHA-256: e57cf175f95b922d1c392d3338c9736f50805e3101dd07f012750125fc3a448a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://studioindelicato.com/userfiles/files/49420788445.pdf In PDF document text
- http://ahkkpcm.org/userfiles/janup.pdfIn PDF document text
- http://korea-labels.com/ckfinder/userfiles/files/71621402708.pdfIn PDF document text
- http://fjzy18.com/image/uload/files/65564979873.pdfIn PDF document text
- https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207e8ce3b9---78348427931.pdfIn PDF document text
- https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ad0520559---sebikiledejasuze.pdfIn PDF document text
- http://fskyok.com/uploadfile/files/9164105471.pdfIn PDF document text
- http://mazurubezpieczenia.pl/zdjecia/fck/file/14204167204.pdfIn PDF document text
- http://www.neoneofitou.com/ckfinder/userfiles/files/81288479817.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b7e08a533ebe603745e828259e7bb598/44289837271.pdfIn PDF document text
- http://kerekesvillszer.hu/UserFiles/file/80984912414.pdfIn PDF document text
- http://supragyn.cz/userfiles/file/tudonafisute.pdfIn PDF document text
- https://mkycc4.com/kycc4.com/userfiles/files/50648594249.pdfIn PDF document text
- https://schachverein-marchhoefe.ch/fcsr/news/upload/file/34150153553.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4fe03447b7389a5d4b4791868528d121/jimafegofepabe.pdfIn PDF document text
- http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/filomuwupapiwo.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bdc6e687e524143cac143dff0be5b455/33644622611.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcc6f3836---4433349404.pdfIn PDF document text
- http://traslochimontalto.it/userfiles/files/siwomotejajanogunega.pdfIn PDF document text
- http://www.gpkoaee.ru/ckfinder/userfiles/files/94281426611.pdfIn PDF document text
- https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/10956bff84d96f6f2155134eba2e7001/90602842335.pdfIn PDF document text
- http://bjbtrh.com/files/pic/file/62835844035.pdfIn PDF document text
- http://sh-songshi.com/admin/upimg/file///50321385644.pdfIn PDF document text
- http://wittymall.com/multimedia/userfiles/file/68999882436.pdfIn PDF document text
- http://zuche0551.com/upload/file/27482305668.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cool+math+fire+and+icePDF 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_off0000e042.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE042	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f859.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF859	10604 bytes
SHA-256: `6a828c62600a79179687814dfc0bdbfdd8f138e86ad987fa62374493c33f1075`
`font_02_sfnt_off0001105d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1105D	18456 bytes
SHA-256: `49bcff97f3ffe6cecbffed7ba82b4816321992108212b4753ef6ceb4d9886db7`

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