PDF malware analysis — malicious · 4cf2ff44148e6d03

MALICIOUS

PDF

112.3 KB Created: 2021-09-05 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: d7275b11397abb9451da1d311e857efc SHA-1: 3ca3073c72671f978fae34ab269a08a169edf64a SHA-256: 4cf2ff44148e6d03c56ff48b7bf9df7111a3d4864f07f7ad001c525d1ebafc28

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

Nyx PDF Classifier malicious score 0.9598

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://cn-biyoute.com/d/files/goneb.pdf In PDF document text
- https://horkolas-gatlas.hu/ufiles/file/suburokidexupaleluvoposob.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e40db5961dc---muwewobew.pdfIn PDF document text
- http://deccanquest.com/konadnew/userfiles/file/2752796884.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a9beba777---2477431905.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/gcnkmsgerdh5vj865r3idgbv53/50101978577.pdfIn PDF document text
- http://entiambalaj.com/upload/file/25689769865.pdfIn PDF document text
- http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/4777566274.pdfIn PDF document text
- http://rubensova16.cz/files/file/40103850726.pdfIn PDF document text
- http://learningkey.org/userfiles/zisiluxolovize.pdfIn PDF document text
- https://pinkrali.com/calisma2/files/uploads/jigedolixonugamijir.pdfIn PDF document text
- http://allaboutdowney.com/userimages/54510700148.pdfIn PDF document text
- http://honghuibio.com/d/files/86749804724.pdfIn PDF document text
- https://nodka.eu/ckeditor/ckfinder/userfiles/files/pepamamopegijeb.pdfIn PDF document text
- https://gloriouz.in/ckfinder/userfiles/files/duvokijokiwisokadosurib.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/sujmhhero7dr13iad8dk6fd3vq/juniniteduxe.pdfIn PDF document text
- http://polesprogettazioni.com/userfiles/files/6359792143.pdfIn PDF document text
- https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b8ddd63dbfd5a49a15a3b689b9e60b29/18627129843.pdfIn PDF document text
- http://www.asslar.de/downloads/78168005762.pdfIn PDF document text
- http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/vukepukomibozirelusete.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd2fce691---zakevosifekivovatuvo.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb27828b808---wojepanetanatimeji.pdfIn PDF document text
- https://immobiliaresancarlotrieste.it/file/58710569039.pdfIn PDF document text
- http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/65387193828.pdfIn PDF document text
- http://tatagz.com/uploadfile/files/lirutezife.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8408bbc304b2f20e996ee5808fa7ffcf/72139470426.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cool+edit+pro+2.1+manual+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00012c7d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C7D	10860 bytes
SHA-256: `b298cfc97c64dd90e5249b30a47375b55691fb974f9ba2378ed78f7e9ba60883`
`font_01_sfnt_off0001459d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1459D	16160 bytes
SHA-256: `fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4`
`font_02_sfnt_off00015b38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15B38	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001734a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1734A	24380 bytes
SHA-256: `cc12eb4cbd79491b01932cc4221eefbb83acda2a4e89027f704c90e4ba6f40b3`

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