PDF malware analysis — malicious · 21a6e7ebdf187402

MALICIOUS

PDF

80.5 KB Created: 2021-08-26 08:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: de8f1649fa42cb05d032af8bb8ff777b SHA-1: 9f69509b9fdb6380fc03512b9ce71cd0a72ab024 SHA-256: 21a6e7ebdf187402990b315cb4dc632a4416991117f63aea53568e85a608d709

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://topinsolventa.ro/userfiles/file/41975600320.pdf In PDF document text
- http://casier-a-bouteilles.fr/file/29132672415.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c026ca869---75546425375.pdfIn PDF document text
- http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/99943142249.pdfIn PDF document text
- https://kisikana.hr/userfiles/file/22942619415.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/febab7b1c2d784fd36b0e640e9eb8d9e/97616136566.pdfIn PDF document text
- http://cn-noah.com/uploadfile/file/62890944458.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160926a691b0a7---metulunaridinaferasawub.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c0df8dc8123---87312757430.pdfIn PDF document text
- http://taskentcompany.com/userfiles/file/banipipaxuvonuke.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/25395428fe4c5298b6743790d5c98c31/tinufamudazavi.pdfIn PDF document text
- https://cuisinescartier.ca/upload/editor/file/magogu.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/tegadukekowomeri.pdfIn PDF document text
- https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/40071510788.pdfIn PDF document text
- http://kryotherapie.net/neu/userfiles/file/82771710298.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9hj71kjm05s3e1ku82d9438e4/38115834954.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbead020e7---sodaponalefami.pdfIn PDF document text
- https://istanajp.com/contents//files/40692085825.pdfIn PDF document text
- http://ji-tien.com/userfiles/file/27903776757.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098800948987---xinowejopewokere.pdfIn PDF document text
- https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/738071db56b0c1786f287a0ef41d3766/kokenaminizewijajimegi.pdfIn PDF document text
- http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdfIn PDF document text
- http://bobiniauto.com/userfiles/file/refuvepejemaxujukuzapiguv.pdfIn PDF document text
- http://www.electricman.in/demo/frontend/web/uploads/files/xikeseboradisebazinuzuv.pdfIn PDF document text
- http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98257830902.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bda1e88e21d---21922649212.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=apa+7th+ed+annotated+bibliographyPDF 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_off0000d6ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6AB	17108 bytes
SHA-256: `6376cc85c18f9294bdc3025522b3160fd9a16eab2ee3114114e09e6cdd753a4f`
`font_01_sfnt_off000102d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102D6	10788 bytes
SHA-256: `db9771fabf9213687cf2223529d1a566fef08cd03a90b721fb0b08513b83fb92`
`font_02_sfnt_off00011b3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B3E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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