PDF malware analysis — malicious · 8cdcd7a5e958f58e

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 02:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: a98d5cc89712c3d4fb0e62f8d5fc4de1 SHA-1: 14a6006732aff38652a41b5434dfa79e179cb323 SHA-256: 8cdcd7a5e958f58eae15e4f4b0778028b7198b0382f604a7c19aa57ac4c79b2f

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate a pattern of distributing malicious content through these links. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload or lead to phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://archism.ru/uplcv?utm_term=word+to+pdf+converter+for+windows PDF link annotation
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/072f025dc36f0810bf95bb73725aa52a/90055867574.pdfIn PDF document text
- http://stolizstekla.ru/userfiles/file/56542354525.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tsch5vvbcar4jt1hq6a5bgue9k/pogimadudi.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccf498411---mamavilavoneb.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/bfllosa34r6q13q4cobmrdmhm7/senunezibakakunatirefo.pdfIn PDF document text
- https://usssecuritate.ro/userfiles/file/42055857936.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e529a71ca2---45783510932.pdfIn PDF document text
- http://www.deopendeur.org/imgUser/file/pavusu.pdfIn PDF document text
- http://ambulatorioveterinarioscapindandrea.it/userfiles/files/vezirevak.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af60450b468---tevejaworekida.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0cff6ffbb0f51fad4b3f860f3e28fbb/jutojesiwozokanok.pdfIn PDF document text
- http://blpest.com/UserFiles/file/72164397687.pdfIn PDF document text
- http://shosholoza.de/file/muvuzaxoluwonasexiviti.pdfIn PDF document text
- http://apcmagon.com/userfiles/mozude.pdfIn PDF document text
- https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bq15coe7tos1enhlirn61qmmtk/lojupidofizodarul.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6852812983---sizaregafedisarotoje.pdfIn PDF document text
- http://sharise.net/Uploadfiles/files/dokekosipusajelu.pdfIn PDF document text
- https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fad7f0e3c---vujezavemofifeputewuke.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/sfglge9c7tl2ndu0n8hs15oo5v/66268157221.pdfIn PDF document text
- https://argekaucuk.com/nbg/upload/files/52510563552.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf27995233---57774438630.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772be453f9---17680944988.pdfIn PDF document text
- https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/03m3m9ospg4a9ppu6hsveaam5p/7986598680.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e20e3a5d---70485178379.pdfIn PDF document text
- http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/19226412467.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fbf9d1e6---47633832332.pdfIn PDF document text
- https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccbfc977f7---xaxesupevotiwifulalu.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c771a38e10---65732670228.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_off0000d99f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD99F	17172 bytes
SHA-256: `bec46013f76460576d8ee410a8a7aeb3a7d032dd472d46b5d3c5660f84e0af1b`
`font_01_sfnt_off00010656.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10656	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011e6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E6D	10552 bytes
SHA-256: `f2bdf86a3741112620b00c52ac9a92c52b8bee657927d3f374e33d2973f54c89`

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