PDF malware analysis — malicious · 66aa60d00efc6637

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 12:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d028ceb12ae26378e6678e00be6cbef0 SHA-1: a557b4b181c0b0fe96b922108bf3cfd37a6053c5 SHA-256: 66aa60d00efc6637da907332c736ff12cdd4f15cc6529fe61539e43e9dda2d14

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a9e848fa463d072087efec11713150b9/56830806431.pdf In PDF document text
- http://fatfailogistics.com/fckeditor/files/file/47800831538.pdfIn PDF document text
- http://www.zywawiara.pl/pliki/nutul.pdfIn PDF document text
- http://kaies.net/upfiles/2109051900280051821xw840.pdfIn PDF document text
- http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/tanulukirazodo.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ufull8gtit7e74ge2hn3dniroj/valafuzulisivese.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6e072eab---soxanigumovi.pdfIn PDF document text
- http://peetersinstallatietechniek.nl/upload/files/38938951525.pdfIn PDF document text
- http://aktifbant.com/resimler/files/wasaxigewitetuxa.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfc117716---16318008228.pdfIn PDF document text
- http://otelm4b.ru/admin/ckfinder/userfiles/files/latakevefifi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336720a6c69---xelopazibom.pdfIn PDF document text
- https://solucionaesp.com/ckfinder/userfiles/files/waxaguzuruwusarimusav.pdfIn PDF document text
- http://wiskind.com/filespath/files/20210907160707.pdfIn PDF document text
- http://usairsprings.com/userfiles/file/46276932555.pdfIn PDF document text
- http://duetsepolno.pl/userfiles/file/gebosaruzuxikuwumuxusope.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397f06ca4cb---pajamoxaru.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fb20a3ba---susumiminivizi.pdfIn PDF document text
- http://duef.ru/public/file/94256623171.pdfIn PDF document text
- http://hifitness.hu/userfiles/file/30822302265.pdfIn PDF document text
- https://karinbentum.nl/uploads/file/34009294198.pdfIn PDF document text
- http://prmakeup.com/Image/files/1817198509.pdfIn PDF document text
- http://recviem.ru/img/upload/wobuxobofib.pdfIn PDF document text
- http://premiercontainerlines.com/media/ftp/file/49011278635.pdfIn PDF document text
- http://techsystem.gr/data/uploads/ckeditor/files/20371633055.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+bedrock+iosPDF 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_off0000e03a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE03A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f84c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF84C	17328 bytes
SHA-256: `b10444f0664ac115ca73f96eef9001968ef696c85d99745cdb4a2524b0a923d7`
`font_02_sfnt_off0001255c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1255C	10648 bytes
SHA-256: `a037aeb7c12e1cae1c738b7448e7885cdf1efccdb3f8e39989bd69f153ebe2d3`

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