PDF malware analysis — malicious · ed22b3e35106a26e

MALICIOUS

PDF

98.8 KB Created: 2021-09-07 05:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 180441a4d77fc89d871518f1a09810ae SHA-1: 8c7619d2dab258b0148fb4f5987874389506ee4b SHA-256: ed22b3e35106a26e483b108902253c1bd66146eda4dcd70ad97a87a0ded28381

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content or phishing pages. The document's structure and embedded links indicate a probable phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9737

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 http://cabinet-blin.fr/ressource/site-image/files/49029433100.pdf In PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16086efc41822c---41383578084.pdfIn PDF document text
- https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/85246703767.pdfIn PDF document text
- http://maternites-catholiques.org/ressource/site-image/files/40216719717.pdfIn PDF document text
- http://winecellarkeeper.com/ckfinder/userfiles/files/39312505579.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7a209ed6---7669246075.pdfIn PDF document text
- https://alexandrapanayotou.com/web/images/static/file/13617270627.pdfIn PDF document text
- http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdfIn PDF document text
- https://kiameds.com/images/upload/files/3886893785.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bb95a53c0a02fc3a1d809d5788765668/zujubobo.pdfIn PDF document text
- http://absolutelyneon.com/userfiles/file/noxiwifaguvu.pdfIn PDF document text
- http://fitviewer.biz/files/file/wakedilit.pdfIn PDF document text
- http://mynigaoe.com/upload/file/20210618041346.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/de7cab97d367ffd5b3cecd8757374813/porutonebojer.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1f0aca979---28352712005.pdfIn PDF document text
- http://unnatiwelfareorganization.com/ckfinder/userfiles/files/befitunuvivo.pdfIn PDF document text
- http://aqcons.vn/upload/files/betogiwafamixatutejefogot.pdfIn PDF document text
- http://aviatechinform.ru/sadm_files/57980000483.pdfIn PDF document text
- https://latrinquette.com/upload/editor/file/jowuwamugujijovemiluf.pdfIn PDF document text
- https://e-fasteners.eu/media/file/pilivod.pdfIn PDF document text
- http://norrlandet.se/userfiles/file/68422774693.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/89d2dfd7a1ff92d716d6e8cfe0efb877/kelefixepujinonoli.pdfIn PDF document text
- https://noddy.nu/images/file/tisifokeboxiku.pdfIn PDF document text
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/463sdmf7tb7grju6cg0mvo9s8m/50597978076.pdfIn PDF document text
- https://vayamcs.com/content_files/files/xemaga.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3095271cce83be8557d4b2ddee458082/gumokodoremorozo.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161114653758fe---32213290286.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=russian+grammar+exercises+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f7f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7F3	16496 bytes
SHA-256: `673690d8795f42c314ff9cb792efa72bbb471aa565c19c37c39f585527e04d35`
`font_01_sfnt_off00010f0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F0A	10944 bytes
SHA-256: `86705fd0dacb158488ecdc10379fa8cce7e2280f90b77781d3a44b9f3da1b5c5`
`font_02_sfnt_off0001282b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1282B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001403d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1403D	24148 bytes
SHA-256: `7c44b9104477c7d8d98b7b403eafb4e0a2bba3a4365c8d9989adf6aae4b09f8c`

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