PDF malware analysis — malicious · 11b1684ea03da908

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 11:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 471818f1e4b1e6c1495e0ba4a876035b SHA-1: 1588977e6d3ab53e6e1e2c4c38b997968f0c60b3 SHA-256: 11b1684ea03da908583e9bf1da0a24d3d4266746a3072fb2f97a93fb88998bd2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://cructi.ru/uplcv?utm_term=save+the+world+mod+apk PDF link annotation
- https://trexanh.net/upload/files/zegedolefoti.pdfIn PDF document text
- https://kurek-rowery.pl/user_pict/file/1346646942.pdfIn PDF document text
- https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2fb7ec86d97fedce1f68faec8c89b97f/68104271676.pdfIn PDF document text
- http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/sarovuwinatisuguviketudit.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83133094225.pdfIn PDF document text
- http://twfindia.in/userfiles/files/pubopunasugigi.pdfIn PDF document text
- http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/72636080044.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f67fd4a716---lasivovafuwupif.pdfIn PDF document text
- https://adsbudget.net/userfiles/file/6644952810.pdfIn PDF document text
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02aa894a8---xaduzojozobuvojamepeta.pdfIn PDF document text
- http://www.springperfect.com/upload/finder/files/4682494003.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/fuzumofosozituk.pdfIn PDF document text
- http://narnivet.com/userfiles/files/xikuwuzadijojudawe.pdfIn PDF document text
- http://gsxr.hu/userfiles/file/51194900222.pdfIn PDF document text
- http://gpe-el.pro/ckfinder/userfiles/files/xineg.pdfIn PDF document text
- https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/jipemerebitamajexatetelo.pdfIn PDF document text
- http://wdnederland.nl/file/mexoforimutudogadapufil.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9312eb8b---31867048797.pdfIn PDF document text
- https://wittnebel.dk/file/28117515225.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1118e7f40---22646312769.pdfIn PDF document text
- https://vibangnhadat.com/uploads/files/80398287781.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3155800c3---fukapepu.pdfIn PDF document text
- https://haruhonpo.com/upload/haruhonpo/files/pevufalom.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f461554dd---bojagexixidizuven.pdfIn PDF document text
- https://sooryasales.com/uploads/file/pujulosepobuzimepefi.pdfIn PDF document text
- https://mertlakustika.cz/images/pages/file/lakipovusujipefi.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_off0000df46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF46	10612 bytes
SHA-256: `356766d4870c8aa9f59443c511e4a3935622a65bfabb8c2e91a55819647d8133`
`font_01_sfnt_off0000f7a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7A3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010fb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FB5	18308 bytes
SHA-256: `69099e91da04337a0708d7fe4d7ea9b5cb9263915dc9e2b9cf2e38646b182828`

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