PDF malware analysis — malicious · f86ca90f722e1af1

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 02:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 94ccc5274b1d2aeb31dcc4ea7b9704e6 SHA-1: b60cfda83661c88cf75503b77fcd42e1ad27576e SHA-256: f86ca90f722e1af1a9c89b9c26e76f5c29a38b79fa1160343fdd08605ec772db

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://www.alitec.es/js/ckfinder/userfiles/files/fanezogi.pdf In PDF document text
- https://tortugafilms.ca/adminfiles/file/2530093711.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2903fbb8bf---movemikurulupuwikazo.pdfIn PDF document text
- https://agrimal.pl/userfiles/file/91295626550.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8219266a4---84722550839.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072760c6854d---71129865609.pdfIn PDF document text
- https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/051430dc85466e4086fe6a8f63230f43/89203564430.pdfIn PDF document text
- https://kcss.hu/korosi/userfiles/file/vewepoweripin.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/glbjg80isl6hmarmn14518m9pa/rubim.pdfIn PDF document text
- https://amthanhanhsangchinhhang.vn/upload/files/pusobulosetoxotipo.pdfIn PDF document text
- https://coonvalleycc.com/userfiles/file/rojelexe.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f64b99e2a1c2e443cb5afa06224ab3ba/nukupimunowupowujaxowe.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbc35602f9---gevogavesorupolurarib.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2f8b4a88---toluluvaso.pdfIn PDF document text
- http://kunjipsc.com/uploads/files/49536222101.pdfIn PDF document text
- http://schodylux.pl/userfiles/file/4398082597.pdfIn PDF document text
- http://remaining-mc.de/userfiles/file/kirakig.pdfIn PDF document text
- http://valleypainclinic.org/userfiles/file/newifa.pdfIn PDF document text
- http://nowator-zpu.pl/userfiles/file/22625323925.pdfIn PDF document text
- http://evevoyance.fr/adh/.-/file/82337262572.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160772ce285950---38979339487.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hovetme4t4kus0etsk86g1pj77/31482828627.pdfIn PDF document text
- http://orthopaede4you.de/userfiles/file/50709175514.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/edmcd7n5h4gl8a2d8kikl0fag4/5763115880.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4e9qj7ae5le0jvjqmgoabr1qtp/90778796013.pdfIn PDF document text
- http://childconnect.com/swi/fckfiles/file/zetigavozure.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=600+usd+to+eurPDF 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_off0000ca9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA9A	10128 bytes
SHA-256: `f52e5c1a5eac9817e50c221cad83f40f08175652541d235dbc56dc759a8e24d5`
`font_01_sfnt_off0000e15b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE15B	17732 bytes
SHA-256: `63bb37e56ce41d93127deb9dddf53b1482424908dc4d317684f6f6ba00e97bc2`
`font_02_sfnt_off00010fb1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FB1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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