PDF malware analysis — malicious · 810baba07b8d7af6

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 13:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6b52dd0dce39dfc4af7662ac291adf6a SHA-1: c20c19c7527cc385016bc30f95e1a5014e6cb1f4 SHA-256: 810baba07b8d7af6a7e91ea4594bcbbaf9814672e597e86fcf4f759a88708d3c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://dakhoathienhoa.net/images/files/45695001398.pdf In PDF document text
- https://stiff.pl/ckfinder/userfiles/files/widetut.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613491be4c3d6---vinifevofefuvilo.pdfIn PDF document text
- http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/levegige.pdfIn PDF document text
- http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8ffc4f6b---jumejuwepejoxapepafiba.pdfIn PDF document text
- https://uleshuzataruhaz.hu/files/file/90961655157.pdfIn PDF document text
- https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/21088405153.pdfIn PDF document text
- https://franchise-vietnam.com/app/webroot/img/files/jelebizejafifenupov.pdfIn PDF document text
- http://ampletrekking.com/userfiles/file/74044898300.pdfIn PDF document text
- https://totounited.com/contents/files/82316847848.pdfIn PDF document text
- http://hengtongrongshang.com/jingkelun/userfiles/files/20210912145619.pdfIn PDF document text
- https://totspotdaynursery.co.uk/ckfinder/userfiles/files/15657532439.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gjf70dnpuaksgm09puuj7i8nt0/38037149142.pdfIn PDF document text
- http://mynigaoe.com/upload/file/20210917045109.pdfIn PDF document text
- http://dedanskecasinoer.dk/userfiles/file/gawajeretokabososibuxag.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2a398609f35db9b781d5f1714eaa827b/xavireninasaponusobo.pdfIn PDF document text
- https://jucariicopilasi.ro/app/webroot/files/userfiles/files/8506500217.pdfIn PDF document text
- https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/69126820250.pdfIn PDF document text
- https://securincasso-online.nl/ckfinder/userfiles/files/kaxopurufi.pdfIn PDF document text
- http://ctmmaximoravenna.com/ckfinder/userfiles/files/81809475917.pdfIn PDF document text
- https://ozmutludokum.com/userfiles/file/diribexexomisi.pdfIn PDF document text
- https://piataafacerilor.ro/app/webroot/files/userfiles/files/32805459058.pdfIn PDF document text
- http://perfect-gallery.com/userfiles/file/84514797075.pdfIn PDF document text
- http://mauchlineware.com/html/chapelstreet/web/userfiles/files/gevogakasovusegafame.pdfIn PDF document text
- http://teplo76.ru/uploads/file/bitov.pdfIn PDF document text
- http://seghers.kr/data/editor/file/4133577546143a67e290d4.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a+major+7th+guitar+chordPDF 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_off0000f2be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2BE	18976 bytes
SHA-256: `a890b7b98493afbd4c176b680282f658c69944277366b9c61f197396d8109b11`
`font_01_sfnt_off0001245b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1245B	10628 bytes
SHA-256: `60eb22718091c5d4098d5544c9e26d4d466538eb8307ee13bb3d5a5294d8f789`
`font_02_sfnt_off00013c86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C86	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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