PDF malware analysis — malicious · 9c85a69378e343b0

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 02:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 948e94dcafb02eaff5b59463d8589c7a SHA-1: da7d7d826867c478c0f4d8c59cbecc1c21af8d93 SHA-256: 9c85a69378e343b003b355e4cbc44c197e4fd7d6852d556be84da5a8f5c27a7a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, pointing to various domains, some of which appear to be compromised WordPress sites. This structure suggests the document is designed to lure users into clicking these links, potentially leading to phishing pages or malware downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=metric+unit+conversion+worksheet+physics PDF link annotation
- https://jamurgoreng.net/contents//files/23658546438.pdfIn PDF document text
- https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/9a9350cde5ac13c105de04cdda99f6f4/safadorosi.pdfIn PDF document text
- http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/8629879562.pdfIn PDF document text
- https://giga-tronics.com/userfiles/files/39832719140.pdfIn PDF document text
- http://wingmanresearch.com/userfiles/files/kazuwesesurazewakaga.pdfIn PDF document text
- http://orchid-daikanyama.com/userfiles/file/93740448477.pdfIn PDF document text
- https://vieclamday.com/userfiles/file/93489402907.pdfIn PDF document text
- http://pop-around.com/file_media/file_image/file/morukuza.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uh9jgr83qr7034n18j83a57lj8/sobuximoxaduzewebizonezat.pdfIn PDF document text
- http://oodow.cn/upload/file/210613091731150028v56mffrul3oo.pdfIn PDF document text
- http://industrialdevices.in/uploads/33703235899.pdfIn PDF document text
- http://www.heksan.com.pl/file/53494012187.pdfIn PDF document text
- https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa90cfd48---14741852541.pdfIn PDF document text
- http://villa-carlshorst.de/sites/default/files/file/55690144226.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9195a041e---34766199675.pdfIn PDF document text
- http://webinaris.org/ckfinder/userfiles/publics/files/vipexixopo.pdfIn PDF document text
- http://kiuruvedenlukio.fi/tiedostot/file/sozib.pdfIn PDF document text
- https://aawyx.com/sites/default/imageuser/file/36526276208.pdfIn PDF document text
- http://sujitonweb.com/userfiles/files/fowatilugoxet.pdfIn PDF document text
- https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/97dc23bb657e884204c01ea9c6d68318/41565313119.pdfIn PDF document text
- http://primebrokeragetx.com/ckfinder/userfiles/files/fefidirewumajuv.pdfIn PDF document text
- http://studiotecnicobergamaschi.it/userfiles/files/rijajuf.pdfIn PDF document text
- http://e-park.es/img/uploads/files/48044435923.pdfIn PDF document text
- https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1j09g1c0e90vto7rap4trii0lh/riwamekavobematakoriwusel.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_off0000bee9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEE9	17036 bytes
SHA-256: `00eb177f913691510a7aef66c2b2a50821268786757323b62eb339bcc5f75654`
`font_01_sfnt_off0000eab3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000102ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102CA	10716 bytes
SHA-256: `2f2e412657f34bf27709c46976c726ad28ce289573ff025c2ecc05995cc20a5f`

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