PDF malware analysis — malicious · 894bc5378ab84edd

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 06:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 2e5c4221f78b2f9fdd33191fd30172e2 SHA-1: 42508794cf4f10ef3f1462bb0b8a7820b18d89e2 SHA-256: 894bc5378ab84edd82ec854320f292255483468a5c024b3408c832318c5b9f24

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://vividconcept.in/userfiles/file/zazawu.pdf In PDF document text
- http://quiltingacademy.info/fckeditor/userfiles/file/wukuj.pdfIn PDF document text
- https://asfus.net/virgsurv/userfiles/file/kawonazesapanizededuma.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb4bd3e0eb---53677487084.pdfIn PDF document text
- https://infypos.com/infyposcms/media/mijukalefupewikavedor.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dbed68e302d882e2f44dda5895523cbe/97827500874.pdfIn PDF document text
- http://dralituncer.net/userfiles/file/99770783933.pdfIn PDF document text
- http://jpind.pl/userfiles/file/rikeladugovamawa.pdfIn PDF document text
- http://vanhacollection.com/images/files/56537490641.pdfIn PDF document text
- https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/31761092835.pdfIn PDF document text
- https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/85135568572.pdfIn PDF document text
- http://abwingssuffolk2.com/uploads/files/82063727229.pdfIn PDF document text
- https://riondene.ch/img/uploads/file/vopizelap.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161302c7001e1b---wizekajikebewugojon.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143967a75558---54260027537.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1c8afbfc---mezatabopebap.pdfIn PDF document text
- http://advairtech.eu/assets/userfiles/file/45180879500.pdfIn PDF document text
- http://se-ty.com/uploads/userfiles/file/bevixudobes.pdfIn PDF document text
- http://career-id.org/ckfinder/userfiles/files/78146094645.pdfIn PDF document text
- http://uni-farm.pl/ckfinder/userfiles/files/7198833683.pdfIn PDF document text
- https://onderhoudnlgarantie.nl/upload/file/tulufipesurekewewupobiw.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69de8cf1d---73799021523.pdfIn PDF document text
- http://polishingmarblefloor.it/userfiles/files/2065940279.pdfIn PDF document text
- http://www.mariabeckmann.com/fotos/uploads/files/43208755461.pdfIn PDF document text
- http://vo23.ru/upload/file/38571523901.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fifty+shades+songs+mp3+downloadPDF 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_off0000d095.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD095	11196 bytes
SHA-256: `2414fd8be2d8b9d96b4c88a578c30f7f374d47a99684c609922a30e2349a9a1d`
`font_01_sfnt_off0000ea70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA70	18760 bytes
SHA-256: `a1bf69bb261bc7c166f76fe2cfe6b9897cc295f9308c936f70bdaac7cdd3dd4f`
`font_02_sfnt_off00011b92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B92	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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