PDF malware analysis — malicious · 3e8846a42180e92f

MALICIOUS

PDF

77.6 KB Created: 2021-06-29 16:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: e03ca4d53bea1389e3e2fe6d6f3fab48 SHA-1: f1703a58fdafb886f1e2dda789dd9d2f86b86307 SHA-256: 3e8846a42180e92f427213e5424af947ee791871b7bd4c7017ef60aab07ec6f3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs, many of which are hosted on potentially compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to external resources, possibly for phishing or to download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://mutitar.com/user_img/files/nenemexen.pdf In PDF document text
- http://fsoa.cn/userfiles/file/54964889655.pdfIn PDF document text
- https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3140190763---55048015507.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/539a4f3db007e75b58ed9689204b23a7/bigajunegazuzefujazu.pdfIn PDF document text
- http://www.kilincsweb.hu/fileok/file/barenodijidazodikutisa.pdfIn PDF document text
- http://dentherapia.hu/files/file/75413036606.pdfIn PDF document text
- https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a292ab8ebad---36215244044.pdfIn PDF document text
- https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/82lfidlv1eiokuo124miq31ol0/savukepavopuzalaromirebe.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdedfc4071---62318824437.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085087f9d9f7---wajupudezes.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/02ecfc971973ce5289b47767968eb955/xuworowamixofonabigeduga.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/777775b620667e9e8f59fb3bbf876d7a/jebivetopi.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/os8pklbs8p790m81p7rn8sci20/27559308011.pdfIn PDF document text
- https://aljuboori.com/userfiles/files/68948662704.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607063b75a345---lawowozosu.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/920de661255d9f4fc08368dc5c816ffd/rakewelepupelisomerasonoz.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608635b6efd51---kixigebapujopavigoxa.pdfIn PDF document text
- http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/29570885309.pdfIn PDF document text
- http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608577ea487bb---83312566550.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d24ee801---80240293784.pdfIn PDF document text
- https://adikkeempat.com/contents//files/pufavulire.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607478961ddd4---87428865783.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5arpqkop47tm66gnhfmmo5qql3/xewisisenopibubarijuxuno.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=first+rate+crossword+clue+5+lettersPDF 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_off0000ccae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCAE	10556 bytes
SHA-256: `996cee842c6a06af95852691c03ee6d1a302920f89ca7dbfcab19211476f71fd`
`font_01_sfnt_off0000e506.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE506	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fd18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD18	16884 bytes
SHA-256: `ecd6755c39d3bb4098cf5af9e360838640122437642ce9d90f866fc36bf07947`

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