PDF malware analysis — malicious · a77bba5f3fb43ea7

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 22:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 07f68d807924fcc9c8dfa55e9a5acfeb SHA-1: 2a45c1559222a604b74f6828acd9252b76546bef SHA-256: a77bba5f3fb43ea719578e1d7494d6527e21c7021f354ddd0ce99b2740e91f2e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

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://lpsa.cz/userfiles/file/vezovabitaredu.pdf In PDF document text
- http://sloplast.com/userfiles/files/59566726386.pdfIn PDF document text
- http://dkind.net/userData/board/file/japojixofolawiruwufamap.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/8u0g3fc6oeun2i1t6crdbsn901/vafezufeta.pdfIn PDF document text
- https://anakmeong.com/contents/files/1584348770.pdfIn PDF document text
- https://bayihoki99.com/contents/files/5626956116.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613181c229587---18911157308.pdfIn PDF document text
- https://bisleriwheel.genefied.co/ckfinder/userfiles/files/94158786270.pdfIn PDF document text
- http://aytekinpolatel.com/image/files/72847697792.pdfIn PDF document text
- https://tedesco.pl/userfiles/file/bugopepiwikeladuma.pdfIn PDF document text
- http://thuexedanang247.com/uploads/image/files/97046538759.pdfIn PDF document text
- https://vyaspublicschool.com/ckfinder/userfiles/files/98758762847.pdfIn PDF document text
- https://charterboatdeliverance.com/uploads/files/laxugivow.pdfIn PDF document text
- http://kaupa.cz/userfiles/file/devixevolaxijumutowofi.pdfIn PDF document text
- http://gomsuhoangminh.com/app/webroot/uploads/files/lepafanufavepira.pdfIn PDF document text
- http://hoangnamjsc.com/upload/files/buxizodox.pdfIn PDF document text
- http://parejalecaros.com/adjunto/upload/fck/files/xujuxedekomi.pdfIn PDF document text
- http://www.gyndoktors.de/ckfinder/userfiles/files/29745008590.pdfIn PDF document text
- http://vhshf.de/File/60181206975.pdfIn PDF document text
- http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133100e27c01---2921178008.pdfIn PDF document text
- http://ks-system.co.uk/ckfinder/userfiles/files/wekipaxevurapita.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161380cbf2c809---favazajotamifebivotewaxar.pdfIn PDF document text
- http://plaschke-partner.com/uploaded/file/zafozajalapose.pdfIn PDF document text
- https://megatekspb.ru/sites/default/files/uploads/14555611475.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fortnite+galaxy+skin+s9PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b8cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d0df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0DF	20020 bytes
SHA-256: `1ede9e857baa228c7201d63e6c5e9e5cda1d5051de6ad3605d0c2d8bf315cd9e`
`font_02_sfnt_off00010290.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10290	10736 bytes
SHA-256: `46b182aecf965b6f650e039189adf7b8fe904a5aaef3e7214d3f902dc282d329`
`font_03_sfnt_off00011b64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B64	16284 bytes
SHA-256: `65dfad125546efb8f2a71f825911919546a9c7e51d723d910fc09019f6959011`

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