PDF malware analysis — malicious · f2d917875e143aa8

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 04:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6b3819f7707436f11bca5acf3276c607 SHA-1: b37aa65aeacb414a6d1c77428016d92d0984a0f1 SHA-256: f2d917875e143aa8c2c51252ed553fd3e9a70dec8b443c29af2fa0834977d2bd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://smwiarus.pl/ckfinder/userfiles/files/37296965813.pdf In PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9175617f2---29064112085.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ee8c8d5f9---duxusu.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/57tej36grjrgeuvh95n94hql12/rovimoxokuvomukufazubuxo.pdfIn PDF document text
- https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/80512305401.pdfIn PDF document text
- http://eros-arena-reutlingen.de/eros/userfiles/file/9164023678.pdfIn PDF document text
- http://olympicburger1988.com/uploads/files/43829784578.pdfIn PDF document text
- http://ecohouse-lab.de/userfiles/file/rofukomagoguvamakalun.pdfIn PDF document text
- https://cebubigsellers.com/userfiles/file/11884530665.pdfIn PDF document text
- http://nextlab-semi.com/files/fckeditor/file/70476690751.pdfIn PDF document text
- https://marathonlaval.com/userfiles/files/jupetufodalorulax.pdfIn PDF document text
- http://wwstationery.com/files/file/29788119970.pdfIn PDF document text
- https://alternatifhirdavat.com/upload/ckfinder/files/13110857098.pdfIn PDF document text
- http://euskararenginkana.eus/files/galeria/files/30044005942.pdfIn PDF document text
- https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/58815750887.pdfIn PDF document text
- http://thietbikhachsanvinhhung1.com/upload/files/38977599291.pdfIn PDF document text
- http://zimmerei-possert.at/74410653096.pdfIn PDF document text
- http://turystycznapodkowa.pl/userfiles/file/12035988691.pdfIn PDF document text
- https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/42b3a1884f8044fc004c17b3108766a0/fonidibilakidelepe.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f26e6097---wupenula.pdfIn PDF document text
- http://thepducphat.com/upload/files/25231008318.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/43e901ec77ff646cfc4d04c98cca31f8/50948181497.pdfIn PDF document text
- http://chiari-web.com/ckfinder/optimist/files/75223223685.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d499169b---54256786412.pdfIn PDF document text
- https://dienlanhhonganh.com/images/pic/file/ditofokiwakevofiwajixej.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=java+to+flutterPDF 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_off0000dc59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC59	17540 bytes
SHA-256: `892ba716931d476b1f67227a29607235dab84a034088f15100d5df511252ad5f`
`font_01_sfnt_off0001098f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1098F	10000 bytes
SHA-256: `30d8c2b13af5f56866c7dc5017902763841a1681dd086947dc8131f45ca254d6`
`font_02_sfnt_off00011ff8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FF8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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