PDF malware analysis — malicious · 541e1d824903b389

MALICIOUS

PDF

76.1 KB Created: 2021-07-26 03:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6f2bb8154c23e5e01d5c9a9a3442b648 SHA-1: 007653036c33394196d99e650576aa6de56b79a6 SHA-256: 541e1d824903b38963485de3cea986b7ee35eae28796cf631743e0c38b9da133

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a ML classifier flagging it as malicious and ClamAV detecting it as Pdf.Phishing.Trojan further supports this. While no scripts were directly extracted, the structure and embedded URLs strongly indicate a malicious intent to redirect users to potentially harmful content, likely a phishing page or a malware download.

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://zgic.ru/!upload/files/69555388029.pdf In PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6449562357---23131883231.pdfIn PDF document text
- http://sarljarry.fr/userfiles/file/xusixusiripuvixesaribizan.pdfIn PDF document text
- https://efficientinfocomm.com/ckfinder/userfiles/files/daduledizagafugoxe.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5e83b0c348b988a863e16d188154e868/kexivabefamajetaw.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608998c6d5f8a---91777978521.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/q0an61ub7naj3alg80vddfrs7e/41422856228.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf720c2bc---84933465915.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e6b33bfb4---2009870880.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/82e983fec2ed89c17ea3f6d4fef4bc57/sodaputatesinujipeb.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/kokegifuraxumeti.pdfIn PDF document text
- http://fontanarosaserigrafia.it/userfiles/file/25609942467.pdfIn PDF document text
- https://strechybenesov.cz/content/85100847830.pdfIn PDF document text
- http://fiumevivo.it/userfiles/files/32919406048.pdfIn PDF document text
- http://axwelindia.com/uploads/vafirenurudizibal.pdfIn PDF document text
- https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/544516c13355382ae6bed5035c074b9d/60457555393.pdfIn PDF document text
- http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cffe95af---59583926316.pdfIn PDF document text
- http://limuzine.md/userfiles/file/88859261733.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a166d9151---82180886612.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5433fc736e---48501408757.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edfac408782---41357762386.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/nivopares.pdfIn PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc218cd2d---wuxuvozowepukejavigejazej.pdfIn PDF document text
- http://dagmar-e.de/userfiles/file/lorapasemugapedilojegenaj.pdfIn PDF document text
- http://ackerviewguesthouse.com/userfiles/file/84179056613.pdfIn PDF document text
- https://pasarangroup2.com/contents//files/79956513772.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/wixegubejufufipugiwur.pdfIn PDF document text
- https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/3n37j4hiec7mq2iljf4muu2rti/20345338721.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rapid+bitcoin+miner+pro+apk+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_off0000c7da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7DA	10872 bytes
SHA-256: `d65680f6367e3385161fecd72e62d112ccd1113d4a6e31b0f056b4208277baeb`
`font_01_sfnt_off0000e0c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f8d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8D4	15928 bytes
SHA-256: `b8a1489aac22b49dbd1bfb5af429752208df942fde74ae6e470e7c4ea281314c`

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