PDF malware analysis — malicious · 5e529fa8c612c4d3

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 10:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: b16a44a9208561f0705c500750c89f67 SHA-1: ec287fae6e0634c2d9f1453d7ccc25f6db9772b2 SHA-256: 5e529fa8c612c4d3eb130e57018ef4251e86be3449acbead7f5079c53e62d286

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'super-forms' and 'formcraft' plugin upload directories. This pattern is indicative of a phishing or malware distribution campaign where legitimate sites are abused to host malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/344733a3fc87735f233ad9a723ca001f/16072407504.pdf In PDF document text
- https://negaratoto.com/contents//files/26281155581.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bd08e1070f682c705df97085e25ecbe3/57081931629.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4e260f586a1e3fb8f0a360d9aa72e73e/86381490788.pdfIn PDF document text
- http://phayaotechno.com/UserFiles/File/7246175616.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a095b90392---tirezoje.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2a797198---wovikojujopufezuki.pdfIn PDF document text
- http://yameitecl.com/ckfinder/userfiles/files/20210707_050556.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ba2734ab---murenerixumukevizipafemon.pdfIn PDF document text
- http://sgo-bage.com/public/files/files/sikibuvedunujup.pdfIn PDF document text
- https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/37fb58c98fb9d7ae858f4a749b58dda7/64328733395.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf74717aba---pajitowavuko.pdfIn PDF document text
- https://viboot.com/ckfinder/userfiles/files/61291501547.pdfIn PDF document text
- http://goodslib.com/userfiles/files/doxajilumepeserapelem.pdfIn PDF document text
- http://www.iciparis.ru/ckfinder/userfiles/files/42476738762.pdfIn PDF document text
- http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/telosusopidonuvusive.pdfIn PDF document text
- http://dioceseofniranam.org/userfiles/file/pivibibakuxonesevunomu.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/9k70csdtb01o1rts9ve33cf0a3/47595872130.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f9540089---suzam.pdfIn PDF document text
- https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fpfnvl0raih6ai8edhja3nqcpk/fidew.pdfIn PDF document text
- http://ndc-group.ru/uploads/files/lapukegimusibinovoka.pdfIn PDF document text
- http://nonstopsushi.com/uploads/files/sidijazikububad.pdfIn PDF document text
- https://mmszke.hu/files/file/1402694377.pdfIn PDF document text
- http://print-printonline.com/ckfinder/userfiles/files/22380366587.pdfIn PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f239d611---55412068924.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=unearthed+arcana+newPDF 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_off0000f240.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF240	18144 bytes
SHA-256: `0f0c1500fa3593fc49cc621108018983604f1a32eb0a3ba188311369a4137610`
`font_01_sfnt_off0001218a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1218A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000139a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139A1	10136 bytes
SHA-256: `621c252ffac71d0cbb9f2cbfd7a6ab10c373fef617eef3d79747685c754e97af`

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