PDF malware analysis — malicious · 6a89a1c9ff3e09bb

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 00:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1a85d08d9287ef1037deff1900691241 SHA-1: 84b585c6c8abc89730f355087da8c4b75e88fb43 SHA-256: 6a89a1c9ff3e09bbfda6e35cea108a9da66f15ebbe661aa0aab476711ec58fe7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://kamerton.nl/clientfiles/75190629051.pdf In PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/m7u1qlpdjv56hf9b550jdve0m4/sobikiwe.pdfIn PDF document text
- http://lev-steklo.ru/userfiles/file/pexavitopiw.pdfIn PDF document text
- http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2gdeiskq4du5k2knkv4cgl95rn/17869869059.pdfIn PDF document text
- http://hengtaixin.com/HangShun/ckfinder/userfiles/files/degopazuzobis.pdfIn PDF document text
- https://tanasiri.com/piceditor/file/rejerakojomi.pdfIn PDF document text
- https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/61tr39kh0e09vep66rs6nv7s64/63007301848.pdfIn PDF document text
- http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e0a10d719---nazobar.pdfIn PDF document text
- http://biosurfest.com/userfiles/files/46808466603.pdfIn PDF document text
- http://labonscafe.com/userfiles/81343954229.pdfIn PDF document text
- https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/884eb3e78425ecd5787f389be3ee0e3f/zuwevipafisawusufuzig.pdfIn PDF document text
- http://biomassasia.net/data_ed/userfiles/file/36536976709.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/57tosplpm752vf4gj7sknoif89/95656269204.pdfIn PDF document text
- http://auldskoolrocks.com/clients/878384/File/4237546585.pdfIn PDF document text
- http://candemdientu.com/Images_upload/files/83958696611.pdfIn PDF document text
- http://studiosantese.eu/userfiles/files/penifulowolusuviworufavev.pdfIn PDF document text
- https://tosto.cl/ckfinder/userfiles/files/tinovozojufijonuva.pdfIn PDF document text
- http://turagent007.ru/userfiles/file/72764183598.pdfIn PDF document text
- https://aplusadvance.com/naver_editor/data/file/gefabeterexewifapijub.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3f20c78aeeaef9974b2cf5b3cdbf940d/ruvegugalofotukugup.pdfIn PDF document text
- https://lochoanggia.com/upload/files/54502095136.pdfIn PDF document text
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8ee3aa31bf2ee0218b64733f4e1ec03d/3818481591.pdfIn PDF document text
- https://aradovan.com/userfiles/file/37973962879.pdfIn PDF document text
- https://pmsp-me.com/userfiles/files/67115873463.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/dfaum74gfocap0e448gql2um45/24328858182.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sanitation+engineering+pdfPDF 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_off0000f07b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF07B	10536 bytes
SHA-256: `0b5c9aee90551496ec423bc83dd3ea9d571f154034ae6c8237e49c9b4d0ef6b2`
`font_01_sfnt_off00010865.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10865	17904 bytes
SHA-256: `10bf8d504335fbfa32035e1d1dd55a272fd1a86716e49f65ff6c834fa65ea7f5`
`font_02_sfnt_off00013712.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13712	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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