PDF malware analysis — malicious · 7bbe3a449a20d672

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 11:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: d60e6e80215f40ace93893b4e21a64ab SHA-1: 58e51b682fd39a252f36a3dbe3b417e390750582 SHA-256: 7bbe3a449a20d672891ca85b8bc300edae6e09fdc1b299dc5f0e09d8da2f763d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI links and the 'link farm' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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://ruishikaishi.com/upload/content/files/2021/06/20210616180930.pdf In PDF document text
- http://idealhca.com/admin/images/file/61744566195.pdfIn PDF document text
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12a81e0950---76113113318.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60d7486e4---xepekobunidodigubejogo.pdfIn PDF document text
- http://korean-school.hu/hangul/userfiles/file/selemadomisut.pdfIn PDF document text
- https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce891094afab0c3ec9ebc7110c8cb260/85906796779.pdfIn PDF document text
- http://alemotta.com/resources/original/file/89268776146.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ff387615e753125902e790af0be6f752/14232932707.pdfIn PDF document text
- https://panificiopasticceriabattaglia.it/file/76535062331.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1a5f79577---74516973446.pdfIn PDF document text
- https://webmenuplus.com/images/file/wolowowuwatuwimigupi.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609691dcb63c4---7758412880.pdfIn PDF document text
- https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/22rraioe8f3s9v4arm2en51d26/lipofokutit.pdfIn PDF document text
- http://gwardiajuvenia.pl/zdjecia/fck/file/nupeberojorujiraravuv.pdfIn PDF document text
- http://loaamtran.vn/files/usersfiles/files/wirubu.pdfIn PDF document text
- http://learnersdigest.org/userfiles/file/50322248472.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b3ce4dd3d---pugojeroxeno.pdfIn PDF document text
- http://c2r-auto.com/uploadfiles/file/2021061301094673499.pdfIn PDF document text
- http://quickvideo.nl/userfiles/file/nekuxizanin.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b41f72513b4---pidepigupulowon.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ivdur1cp7s19ncr2t5s3ce1q3b/nekavanaguludubuzow.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6539abed35ceb8927c0811fc589904d6/68660517327.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/57121lp454u94a6l8a4gfrded7/33004069088.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/41574228401.pdfIn PDF document text
- http://chithanhplastics.com/uploads/userfiles/file/2100953243.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=applied+bayesian+forecasting+and+time+series+analysis+pdfPDF link annotation
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7992489313b5acdc72996e05bde1fd45/60065819303.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e21e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE21E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA2F	16352 bytes
SHA-256: `470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555`
`font_02_sfnt_off00011035.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11035	16588 bytes
SHA-256: `f5229146270fee7f51ebfa8ad3604d70d701974796bbde719f5734a62fef897f`
`font_03_sfnt_off00013b79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B79	11200 bytes
SHA-256: `da425b11dbc189caab8efd5f40d73f9e2d6bb81ea0726ceb4ed9c5d14be02f94`

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