PDF malware analysis — malicious · f131350b933222be

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 16:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5ee2ada2b7816e75e0c026bac4b25e39 SHA-1: b0df652c4e2b6887fd4502eb64eb9de30aeba0f9 SHA-256: f131350b933222beb26b1789f006e9d20898643f3867521539f8f06a15e5097f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple external URLs, many of which host further PDF documents. This behavior is indicative of a phishing or malware distribution scheme, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zepokofusuti.pdf In PDF document text
- http://marinapogon.pl/upload/file/milugepokeb.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/2a855cd2f322cf472f3b838d7a4591e7/savejefazalovumifeluxaka.pdfIn PDF document text
- https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a2d63ce0---87507379094.pdfIn PDF document text
- https://soudurelauziere.ca/upload/editor/file/votidegokekikofidazewi.pdfIn PDF document text
- http://ebiocell.com/uploadfile/file///2021061623061163.pdfIn PDF document text
- http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/26739046250.pdfIn PDF document text
- https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78b0bea108dd60c11a66000cef532090/voruwiwikifozinewamobina.pdfIn PDF document text
- http://forglass.sk/userfiles/file/gasilan.pdfIn PDF document text
- http://www.adarshvidhyasankul.org/userfilesfile/52094870352.pdfIn PDF document text
- https://ketdoanbus.com/webroot/img/files/kufutexasipav.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f92a9f95a6b73f9c1f0ed31dc6b564a6/55094083677.pdfIn PDF document text
- http://sevimticaret.net/userfiles/file/15820369413.pdfIn PDF document text
- http://coimbrasoftware.hu/images/uploads/files/10607853340.pdfIn PDF document text
- https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/mixibizokuxariwevema.pdfIn PDF document text
- https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/95281124898.pdfIn PDF document text
- http://buildinggodskingdom.com/webcms/file/gifikezazedofezi.pdfIn PDF document text
- https://a2designbg.com/userfiles/file/70093902591.pdfIn PDF document text
- http://dashoernerboot.de/userfiles/54513397248.pdfIn PDF document text
- http://askort.pl/Upload/file/jasivusati.pdfIn PDF document text
- http://studioarchperissinotto.eu/userfiles/files/salafabevovun.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369945960d---13603517096.pdfIn PDF document text
- http://archinfo.ru/uploads/file/16600702369.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a839a840878---58294024023.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=examples+of+oviparityPDF 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_off0000cd55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD55	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE567	17436 bytes
SHA-256: `ba511ca81cf47540cbf35e4f22c0a352f5723506c11de48fbae2b34d826e6842`
`font_02_sfnt_off00011215.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11215	10680 bytes
SHA-256: `c28ef433341dfe46c0b32e821266b2b62d06ecf88402674b1545a9a317defc4e`

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