PDF malware analysis — malicious · 5ef12cc6efe1c9f2

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 17:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 3268e7d61baaade57b79912487fe3ff0 SHA-1: 437203dda671ae81ec5b86873a4377668e80b3c3 SHA-256: 5ef12cc6efe1c9f294b6b1b2fa03c8b1b3c71dc0e64851acaff39a990d476c1d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

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://huntic.ru/uplcv?utm_term=what+do+you+mean+by+magnitude+in+physics PDF link annotation
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/31a7fe1bd98a8b21f4b7c0d244ea482f/dozedi.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b4bfd4a1e27c1d343127baece7c3038b/12756365986.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160987eabcb228---nezalidekodomuzodom.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608073b9e9abe---16072125531.pdfIn PDF document text
- http://steakclubhn.com/campannas/file/witabefitapukaridojegeb.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608483ade3d78---xasur.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d33061e5744---43131033944.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0d7f006f---nodaroperot.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f07b94bf---28165416581.pdfIn PDF document text
- http://china-hold.com/UploadFile/file/20210617230107693.pdfIn PDF document text
- https://klairtransport.com/uploads/files/84879628611.pdfIn PDF document text
- http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088571cd6015---61743712880.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac98c62bafe---zifikadiw.pdfIn PDF document text
- https://appfacile.it/file/wexoge.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af070982b8---vizewiroko.pdfIn PDF document text
- https://hogies.com/includes/template/uploads/file/47586938155.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jnt58lb8ed2optf601c4c6rhh1/72943334367.pdfIn PDF document text
- https://tajeer.co/userfiles/file/dafofaxelalolo.pdfIn PDF document text
- https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14a0e361d---mudik.pdfIn PDF document text
- https://globalquestconsulting.com/userfiles/files/wexopotifirerefa.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/m9h723gf5qs20995rm85ia54u4/lejij.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d420e0304---17160349111.pdfIn PDF document text
- https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9be475a274cf6a8daa37bef904b398eb/38370875428.pdfIn PDF document text
- http://4x4autok.hu/userfiles/files/sopavexinixevuwum.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_off0000f056.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF056	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010868.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10868	16632 bytes
SHA-256: `b2b9dd11e72c73de91dcb154014160fa8c6bcec35afd60e1ff6641d0206e81f8`
`font_02_sfnt_off000133be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133BE	11160 bytes
SHA-256: `b39667aa125e40c56018eb3c8b2d690956352b617e6c87c8df14725a9d29ffd0`

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