PDF malware analysis — malicious · 31154842ea025d07

MALICIOUS

PDF

80.8 KB Created: 2021-09-29 00:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 014e4cd2af9b1ba41ea8ac08b1e65bb3 SHA-1: 0d7a723a98de922afe0b292863215b54294c0d98 SHA-256: 31154842ea025d077dfaf92ab625137194df8cd07a159fe42b95bbdd47e7da69

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised domains and potentially disposable hosting. The presence of numerous PDF links suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9944

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://alansglobalservices.com/ckfinder/userfiles/files/verivolevegazifozarip.pdf In PDF document text
- http://yuanyoujie.vip/userfiles/file/mabazefadilutufopotuwebin.pdfIn PDF document text
- http://esrafisek.com/images_upload/files/62548614874.pdfIn PDF document text
- https://terminarz.online/kosmetyczka/krakow/files/jobopofenoxuta.pdfIn PDF document text
- https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddf5e231c0---94273209679.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa15c5d07a---28817582917.pdfIn PDF document text
- http://sudeoksa.com/userfiles/file/20210903071333.pdfIn PDF document text
- http://gamboeng.com/assets/ckfinder/userfiles/files/8819712712.pdfIn PDF document text
- https://agri-mal.pl/userfiles/file/30728114630.pdfIn PDF document text
- http://longarmquiltingacadamy.com/fckeditor/userfiles/file/zugitugokufawojave.pdfIn PDF document text
- https://geneticapanama.com/userfiles/file/66089541968.pdfIn PDF document text
- http://kdesignuk.com/userfiles/files/jikowenitovinunexafi.pdfIn PDF document text
- http://www.naraihillgolf.com/admin/userfiles/file/2025361401.pdfIn PDF document text
- https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/76456046179.pdfIn PDF document text
- http://dotacjedlaoze.pl/userfiles/file/19575459583.pdfIn PDF document text
- http://dsagco.com/Upload/file/1101212440.pdfIn PDF document text
- https://thefencedocumentary.com/adminfiles/file/12191167596.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dbd114562bcee08bb509249477a624b1/90612170184.pdfIn PDF document text
- http://camelliafb.com/uploads/files/202109070136344387.pdfIn PDF document text
- https://thaiahpa.com/flash/files/59113029077.pdfIn PDF document text
- http://bakefruit.com/uploads/files/202109081734493265.pdfIn PDF document text
- https://tbsva.org/Upload/files/20210927204418.pdfIn PDF document text
- http://abakus-routing.co.uk/ckfinder/userfiles/files/sirigutofunupusat.pdfIn PDF document text
- https://mwasafat.com/uploads/files/51281944501.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=iphone+11+pro+max+vs+note+10PDF 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_off0000b7d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7D2	20616 bytes
SHA-256: `2c93415f913ebb127f13a61eaad60aebb837d7155ef04f685ea937c5243ec126`
`font_01_sfnt_off0000ed12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010523.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10523	16188 bytes
SHA-256: `800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34`
`font_03_sfnt_off00011ada.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11ADA	10672 bytes
SHA-256: `a19957cda271ac01be76819689db3a0ee6d9488b36bdf3a367406d4204e91093`

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