PDF malware analysis — malicious · 4d8ae9989d409afc

MALICIOUS

PDF

88.0 KB Created: 2021-07-04 15:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 6a5ed6cebbf82b2109909d15f923e385 SHA-1: 603c7a5136727ab72d8a58630c52c5a24d6b470d SHA-256: 4d8ae9989d409afca7eee77dadd6b1716201080b6ef13726a33aba963745023c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=heart+rate+of+3+month+old+baby PDF link annotation
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/23b25f8871382c1ce21e726b2efd8aa7/nawojiwujovadexerojudi.pdfIn PDF document text
- https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d4c0014b---tisovozutejanamigusa.pdfIn PDF document text
- http://kadernictvo-svetlana.sk/editor_uploads/system/files/51290674365.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/15dd34958fe42fda78c9f97530f3d77e/97479673146.pdfIn PDF document text
- http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab796e0b72---tutowikisoboduge.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ca0d6a278e71b722030735dc081de027/pubelalunabo.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bm02o1qhhmnjf3adogl8njl8k3/82871087394.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c5b4c1026d2f0576575865a2658aa63a/81875526064.pdfIn PDF document text
- http://ulrike-mayer.de/userfiles/files/76980971653.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1rf4f6oecc46ompb5q9a7r6ca3/87327082076.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1294522104---mazifu.pdfIn PDF document text
- https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/803ac1cd4ed1da2247754ec9550f19b0/pumixenopokep.pdfIn PDF document text
- http://bjbtrh.com/files/pic/file/wulobejovuwuvexokobol.pdfIn PDF document text
- http://novussiteyonetimi.com/uploads/file/xikeg.pdfIn PDF document text
- http://polymer-optix.de/userfiles/file/kiwokuwuxofolesilore.pdfIn PDF document text
- http://seabeachthailand.com/UserFiles/file/85767457743.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608daaee9514f---7366351425.pdfIn PDF document text
- https://j-kowalewski.pl/uploads/userfiles/files/wofomovevetafes.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160788d40b0ab4---dizebewixan.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b40eea84---85586162755.pdfIn PDF document text
- http://trimblehighalumni.com/clients/84492/File/87614112179.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/00938c1769676db77cf13bfde85b3052/pekiror.pdfIn PDF document text
- http://auksozvynas.lt/userfiles/file/58881781100.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d6425a52735---23029269110.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_off0000f584.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF584	10776 bytes
SHA-256: `9786da900364c8e2e3daf5d7426334a0f4e0e0679d15647257f3e61479015bf1`
`font_01_sfnt_off00010e1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E1C	16688 bytes
SHA-256: `d16b790b7716347d2118e10a369b764fe26e78a5ba7f4434ed69aed5844d7054`
`font_02_sfnt_off000138f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138F7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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