PDF malware analysis — malicious · 3df5110f01f51939

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 16:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 7af285fb655ef1fef7646fd1655f61ad SHA-1: da1845c85d83ee30011fa48eac2a90b804a301cc SHA-256: 3df5110f01f51939bf6214c8ce36fab51a647517cf8d14684f22ab9a209f7c35

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links strongly implies a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160767cb62c1e4---wabajipufizusujaxu.pdf In PDF document text
- http://humanlitech.com/files/files/43246042688.pdfIn PDF document text
- https://thanaclusterwestgate.leaddeehub.com/userfiles/files/21627046629.pdfIn PDF document text
- http://mwflower.com/upimagesfile///50429431883.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e2797c74---davufoviwizugel.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802b367b3c---90824838782.pdfIn PDF document text
- http://koreadramatour.com/FileData/ckfinder/files/20210728_282363A210D01306.pdfIn PDF document text
- https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/93517706263.pdfIn PDF document text
- http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/patunaketemu.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d4bdf1b87825dee7862f8794c01d1534/30956361608.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/texebufud.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/d27gqq6t8busm3pmhg15n0ohu4/takegisali.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf78e6819d---90921630867.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73ebeeded---65920686089.pdfIn PDF document text
- http://trans-serwis.com/userfiles/file/lerujakerivuje.pdfIn PDF document text
- http://first-group.kr/ckupload/files/tibiwa.pdfIn PDF document text
- https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/6ee2ddea429b386ed3d39d6181899d3a/62983720107.pdfIn PDF document text
- https://alstar.uz/images/shared/file/28883377080.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/293ee9540b617be6c9123588d17d8fcc/70484480586.pdfIn PDF document text
- http://4bx.pl/public/file/75015749027.pdfIn PDF document text
- https://bititechnika.com/uploads/file/43519184609.pdfIn PDF document text
- https://mundolibre.cl/uploads/userfiles/files/1848719138.pdfIn PDF document text
- https://haysalon.com/public_html/userfiles/file/kotineku.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ca977263---49875673624.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe2e2826---2266471732.pdfIn PDF document text
- http://bitite.lv/media/txt/122/file/4046230982.pdfIn PDF document text
- http://maksimetall.ru/files/40920808817.pdfIn PDF document text
- http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608735384c08c---luvufedarewufowino.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2001+hyundai+tiburon+repair+manual+free+downloadPDF 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_off0000eabf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEABF	18500 bytes
SHA-256: `7c53ea4975b9253733f81663fa40e9bc8361bf796eeb1fdf5f1c1bee78e5511e`
`font_01_sfnt_off00011a8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A8D	11232 bytes
SHA-256: `bd64292812c0480ccd99777a15729e58509d2fb80a3a0e0dce7de66793a262e8`
`font_02_sfnt_off0001348d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1348D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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