PDF malware analysis — malicious · 4bfaf2cb7fa238b3

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 21:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2a0122b21beea2757978836a7a6060d1 SHA-1: 7550ec7a121cd8a2bb3719ca12cde4a070745e47 SHA-256: 4bfaf2cb7fa238b3af253e7dd9b286027fa5e22f89f49d9aab09dff05da5e6ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or malware delivery lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://njuhome.pl/ckfinder/userfiles/files/49260982466.pdf In PDF document text
- https://sogelec-eng.com/files/ckfinder/files/kusuvaramurosukasijije.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed810c13---mobudobod.pdfIn PDF document text
- http://geriatriccarenewjersey.com/userfiles/files/ripokezejunoxezufutixaja.pdfIn PDF document text
- https://aduanaldelvalle.mx/userfiles/file/17402744400.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/49282389765.pdfIn PDF document text
- http://diakmelo.hu/ckfinder/userfiles/files/tukafekokagomife.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6aca83be508c93d844325aea3146343a/kixujabowel.pdfIn PDF document text
- https://damsindia.org/admin/uploads/file/63279930456.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f4f333a0cdeb08331e7b8a40f3e0eca4/92311557880.pdfIn PDF document text
- https://faresaldabbous.com/uploads/file/52439982981.pdfIn PDF document text
- https://haisanquangninh.org/data/dulieu/files/perawajopuraparivunati.pdfIn PDF document text
- http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/73066819726.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/af796f71f1cecbb2024cb8b568f0e473/tufujonofepusox.pdfIn PDF document text
- http://resetimpianti.it/reset/public/file/sogevavutipatizivupisiv.pdfIn PDF document text
- http://remaining-mc.de/userfiles/file/juzujepiraseraxifimogo.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161170b1e9d8ca---16935041117.pdfIn PDF document text
- http://esrafisek.com/images_upload/files/36590746640.pdfIn PDF document text
- https://stalbeckers.nl/userfiles/image/file/92359826656.pdfIn PDF document text
- https://pingthye.com/userfiles/files/pibusukaletokoxobare.pdfIn PDF document text
- http://startent.ru/SITE/files/editor/file/gugawoludo.pdfIn PDF document text
- http://kleinschadenexperte.de/userfiles/file/53331073244.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ffbe62c51---5740328269.pdfIn PDF document text
- http://booklandbooks.com/userfiles/file/49403802829.pdfIn PDF document text
- http://bdn10.cz/files/file/kamaxelunufipekakadalupub.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=compressible+fluid+flow+nptel+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_off0000ce9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE9A	10856 bytes
SHA-256: `dcd7c0b9dd78a3c8196ac0d6bca3a7e6138c475e7ed191203efd14954084e2eb`
`font_01_sfnt_off0000e776.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE776	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ff88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF88	17264 bytes
SHA-256: `71c007d5b9e1373a3035d2b578c0a861a19a7589c7d52d9ea07640a9a2f7b4b4`

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