PDF malware analysis — malicious · 1c0f94d0e263a701

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 05:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 878edb4d039569039772962d340c268c SHA-1: 0fd5de17ead9753c8dd5e7b24732ed56bcfb44d4 SHA-256: 1c0f94d0e263a7011db681616b8c9bae661d54e281f15848cf93a5aae093c3ce

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to other malicious PDF files, likely for phishing or malware delivery. No scripts were extracted, but the overall pattern points to a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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 https://drafthe.ru/uplcv?utm_term=iphone+create+qr+code PDF link annotation
- https://designclarf.it/file/51976517439.pdfIn PDF document text
- http://baohanhranghm.com/upload/img/files/wudekozagoritak.pdfIn PDF document text
- https://mamotato.ro/userfiles/file/1802176478.pdfIn PDF document text
- https://pergamine.com/ckfinder/userfiles/files/waketonolex.pdfIn PDF document text
- https://deltagroup.bg/uploads/file/vosagizafaduvopot.pdfIn PDF document text
- http://tko.wavedev.net/img/files/files/zalokij.pdfIn PDF document text
- http://pc580.cn/upload_fck/file/2021-9-19/20210919061456408020.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a8093c7a5b9e4cb99bfebb2e9537f728/mirasutebufugawugulowutu.pdfIn PDF document text
- http://totoumi.jp/upload/file/3927295246.pdfIn PDF document text
- http://1utilaje.ro/mm/file/kokusubo.pdfIn PDF document text
- http://benly-carson.com/product/files/38757230509.pdfIn PDF document text
- http://gustosandvic.com/ckfinder/userfiles/files/9507249737.pdfIn PDF document text
- https://nasikampung.info/contents/files/kugidadaminatupofiber.pdfIn PDF document text
- http://printific.com/images/contentimages/files/90504516179.pdfIn PDF document text
- http://jshanwoo.com/ckfinder/userfiles/files/95473513114.pdfIn PDF document text
- https://forexinc.ca/upload/editor/file/67122496448.pdfIn PDF document text
- https://zaragozadenoche.es/upload/files/xiwodorerorobibitadu.pdfIn PDF document text
- http://robwalker.net/fckupload/file/jetewonediwawojutazu.pdfIn PDF document text
- https://autosaloncenter.com/uploads/files/rusodumojaxule.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135435875c76---38007123870.pdfIn PDF document text
- https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/32453539991.pdfIn PDF document text
- https://sunridgecorp.com/uploads/files/202109160920126273.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4acda6a5---taxomegabiw.pdfIn PDF document text
- https://infotechsystemsonline.com/ital/www/img/file/72333105424.pdfIn PDF document text
- https://biroestarsa.hu/uploads/file/97102129704.pdfIn PDF document text
- 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_off0000e1f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA0D	10404 bytes
SHA-256: `5ef7aa092224250e68254659469481be1e006bfb255cf8fdf7ef9a86e3715eca`
`font_02_sfnt_off00011146.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11146	17112 bytes
SHA-256: `6f5f2a73a16d2899eb8b166c9cd403501a2dae140241f5a5ab4e80f463745d80`

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