PDF malware analysis — malicious · ebf39fe2c58c6585

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 19:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 634fc7cb12f34b9fda719b5436d7b15a SHA-1: fccbe794ed0b668d8d809875b0a7b7400fb8a216 SHA-256: ebf39fe2c58c6585d0f820ba5938d79e6074c96c05e1a82ed05813ec35c13292

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, which in turn host more PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=northstar+reading+and+writing+pdf+vk PDF link annotation
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f111a26cc0---26928433501.pdfIn PDF document text
- http://abbwingslynnhaven.com/uploads/files/pavimerusivo.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qm0j28ujfge89vctukvurs8s65/tawega.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b224e71b93e---2938318419.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53638580db---figijoxujono.pdfIn PDF document text
- http://tangiahoang.com/skinkorea/Images_upload/files/33906298143.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8ab88fb54a5ef1fd8443e6b6ed4c1b66/xabukixujizugegafofu.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/lemesu.pdfIn PDF document text
- http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9569f66f5a3ef400e69a019133649f24/papen.pdfIn PDF document text
- http://usateatop.com/_upload/files/856018640.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/14259844940.pdfIn PDF document text
- http://instant-image.net/UserFiles/Site/File/18929593835.pdfIn PDF document text
- https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b06549dd116939577158f47f69ade434/zawutulugokanonikepokuno.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/bfd206d00ff0969eac09318024941907/6422143804.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67e1ec5a93---runagonor.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/73717ddaf2f252212e80ab9f7773df23/31414999572.pdfIn PDF document text
- http://bizbecho.com/pa/trainstation/uploads/image/file/bigirepanalagodimu.pdfIn PDF document text
- https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/fcf9bbebcab6be0065b6f2b6874f68fe/katinijizozarulidurap.pdfIn PDF document text
- http://nakatka.com/files/file/bifizavobax.pdfIn PDF document text
- http://placc.info/up_image/sizoximukilezanumiro.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868feabdc58---taxiruwodasavet.pdfIn PDF document text
- http://oresteruggiero.com/userfiles/files/34088479045.pdfIn PDF document text
- http://piotrkowska77.pl/zdjeciafile/lewinofaxujaripudatoji.pdfIn PDF document text
- http://gesundimjob.at/images/content/files/58306890464.pdfIn PDF document text
- https://dehayemek.net/upload/ckfinder/files/92608357961.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cea9f7a068ae62733ef64db8c25d2128/rozomol.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_off0000ce3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE3E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e650.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE650	18416 bytes
SHA-256: `d8111a1f0be6c8e6f4e017d70c75fed4d0e6357f91fc61a21bb899cbdd8893a8`
`font_02_sfnt_off000116be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116BE	10952 bytes
SHA-256: `f6aa5ddbeeb30d41123c7f9cf33b71583a71791c8d5536700c7b20187824d5b1`

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