PDF malware analysis — malicious · 2e2cd51523ac1413

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 23:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: e66ea9f8453dcf17e82f27af7f86e8de SHA-1: d97fd7cac9f7f09cadc858ebd95a124b175d181d SHA-256: 2e2cd51523ac14138e5522e79213c996a448307593708eeb1ad144731366d6b6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://ketchas.ru/uplcv?utm_term=best+hdr+player+for+android PDF link annotation
- http://piotrkowska77.pl/zdjeciafile/wudexamuxijopokafir.pdfIn PDF document text
- http://hypotekaprezamestnancov.sk/res/file/42348756877.pdfIn PDF document text
- http://jrecchina.com/ckeditor/ckfinder/userfiles/files/59356152939.pdfIn PDF document text
- http://indecomavo.pl/userimg/inc/lojisunotemanupogi.pdfIn PDF document text
- http://buddhavehicle.com/userfiles/file/perekunuzimenip.pdfIn PDF document text
- https://basundharamart.com/userfiles/file/70735389460.pdfIn PDF document text
- https://infrastone.com/userfiles/files/40744175476.pdfIn PDF document text
- https://maintogelonline2.bet/contents/files/negiwisivuketebikunidom.pdfIn PDF document text
- https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/29148666407.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed98b0e2f---32911756322.pdfIn PDF document text
- https://thefencedocumentary.com/adminfiles/file/megejojas.pdfIn PDF document text
- https://firsatpin.com/calisma2/files/uploads/jedogogizafuzojidusajukex.pdfIn PDF document text
- http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631746811.pdfIn PDF document text
- http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134714cbc5d3---15811761017.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c22813283---21951867179.pdfIn PDF document text
- https://idea-web.ro/app/webroot/files/userfiles/files/pogatuzifoniwavowujipu.pdfIn PDF document text
- https://www.tyrtaios.gr/ckfinder/userfiles/files/30458193006.pdfIn PDF document text
- http://fertilityupdates.com/userfiles/files/74281098835.pdfIn PDF document text
- http://moretonassets.net/userfiles/novixebiwes.pdfIn PDF document text
- http://studiobonvino.com/userfiles/files/47634715180.pdfIn PDF document text
- http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130900ba9d40---bawoset.pdfIn PDF document text
- http://copingconversations.com/userfiles/file/gaguperugojafumuzepeneka.pdfIn PDF document text
- http://fundacionecla.org/resources/original/file/rakovazuvunoxojozopa.pdfIn PDF document text
- https://malinaionescu.ro/userfiles/file/wipesufetoteg.pdfIn PDF document text
- https://doctornhospital.com/banglanews24/editorsfiles/files/vujelaxipanun.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef7d09808---pabosuxazez.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_off0000de5b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE5B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f66d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF66D	18288 bytes
SHA-256: `45038511b83ec8f6573bffd75f10feb8ab4df036883b58687a04ec780ba974bc`
`font_02_sfnt_off000125f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125F3	10760 bytes
SHA-256: `d5ba4769309d2aa5b199bafaa6169ef83a575cfd6e26318e61a11fe462e3ab96`

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