PDF malware analysis — malicious · 04e6a44d71fcc3d0

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 21:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6b7a34e755b8c4fddbad702083a2a97d SHA-1: 7d0a1609394d18c11640f53a4aa12e2354952fb0 SHA-256: 04e6a44d71fcc3d095bc75d2ee73889f2e4923108519e4c0803f80e94d8151e6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://olsztyntransportmedyczny.pl/userfiles/file/kupidefipunupogevudaboxa.pdf In PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lba60cpn2saoujsnitjl07lg3u/82161789463.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8e33e4b801ca54cba96cea9a4ec3f1ee/82170794287.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ab8f8b50e3b0c15fd01402b6f2f7f0cb/69458820888.pdfIn PDF document text
- http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5c24288c4---31463545180.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30daaeedf---81747007531.pdfIn PDF document text
- http://stepasidemedical.com/images/uploads/file/fuxulos.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ca0f041d3b3f76c76a9f3810d9bcb884/37158028997.pdfIn PDF document text
- http://www.bandungmesin.com/file/tuzobuj.pdfIn PDF document text
- http://smcertificationservices.com/userfiles/files/gipekinasupafobuzem.pdfIn PDF document text
- https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lo1q9ju8iavn6qjbl0ktabk3rl/gojuvezaguvobam.pdfIn PDF document text
- https://kimtuong.vn/isc/public/files/fckupload/file/folotepetuwirarapenofe.pdfIn PDF document text
- http://aunay-sous-auneau.fr/ckfinder/userfiles/files/14079391326.pdfIn PDF document text
- http://goldartline.ua/userfiles/file/61854101957.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d1c502a4---73570320480.pdfIn PDF document text
- https://et-auditing.com/userfiles/files/74084283796.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bad5a28a89e---nubozibidufu.pdfIn PDF document text
- http://zonweringbelgie.be/ckfinder/userfiles/files/wovawamozevalisisa.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077720bdcda7---17800939528.pdfIn PDF document text
- https://limpiezasinasel.com/userfiles/files/69278667943.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/sisovepet.pdfIn PDF document text
- https://stdtekstil.com/upload/ckfinder/files/97514882826.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/11e50629544ab702bd493b39597cc164/dafafilomibekuriga.pdfIn PDF document text
- https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/f909555671bd82f00896b22165d5f47c/penug.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/edb8e6fe9e5a96459a75a42459752366/favexu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=electroconvulsive+therapy+usesPDF 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_off0000e541.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE541	16648 bytes
SHA-256: `06913d3af27bdee099c02890526fadca7c33709cbc9c44c0d2677b3877cd4278`
`font_01_sfnt_off0001103f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1103F	10736 bytes
SHA-256: `22cf44960041c8850cd338bde6952f7a57e99a08f9446eae18c7e30e3f9d3447`
`font_02_sfnt_off000128e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128E5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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