PDF malware analysis — malicious · 9240a265bd558f64

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 18:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: aa4ec736bb0db05af7b49422a40fc454 SHA-1: 771c0b2141ee4b370438359d33f28e71ef85450f SHA-256: 9240a265bd558f64443734f9ce8f1b686470f3499a7a7c36af38ce9f7ce407e5

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised CMS uploads and disposable hosting. The embedded JavaScript stream and numerous external URIs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. The primary attack pattern involves leveraging these links as a lure, potentially as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=reproductores+avi+para+android PDF link annotation
- https://autoteam.in/ckfinder/userfiles/files/74793886928.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16149aa4b60c47---76179729693.pdfIn PDF document text
- https://argentinaproduct.com/ckfinder/userfiles/files/79070725328.pdfIn PDF document text
- http://sjmhospital.org/files/js/ckfinder/userfiles/files/lubovoj.pdfIn PDF document text
- http://kazuma.ru/ckfinder/userfiles/files/34907501021.pdfIn PDF document text
- http://studiogiovannone.com/userfiles/files/jawopavovezukusamajulage.pdfIn PDF document text
- https://brukspec.pl/upload/file/75983363650.pdfIn PDF document text
- http://sirindhorn.net/upload/File/6649573098.pdfIn PDF document text
- http://www.mostenpo.jp/userfiles/files/jiwixopaposoginedo.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433797cadc---54579420970.pdfIn PDF document text
- https://nezrenweb.com/calisma2/files/uploads/23733104108.pdfIn PDF document text
- https://eko-briketes.lv/userfiles/files/98785738040.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f2d66ab2---13810910490.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/p4u7v8frsfsdc79bjgno13gu9h/43816391208.pdfIn PDF document text
- http://n2nlah.org/UserFiles/file/90919715376.pdfIn PDF document text
- http://the-bom.kr/upfile/files/9760263142.pdfIn PDF document text
- http://fecoil.com/userfiles/file/xirixixudaki.pdfIn PDF document text
- http://www.impactit.in/ckfinder/userfiles/files/30156571292.pdfIn PDF document text
- https://stw-nowogard.pl/download/file/zuxotolasan.pdfIn PDF document text
- https://sabunwangi.com/contents/files/lonenofafeluju.pdfIn PDF document text
- http://bluecars.pl/userfiles/file/bulopotufotuvufevivatojo.pdfIn PDF document text
- http://homeopathyhk.com/files/35336397508.pdfIn PDF document text
- http://ladna.pl/user_images/file/2660221543.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4920386a2---22706551296.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_off0000d00c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD00C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e823.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE823	10672 bytes
SHA-256: `9175c27e6f7baca389a68bbcd2314d057545e3d90c7edf27b72722bebddf087c`
`font_02_sfnt_off000100bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100BD	18348 bytes
SHA-256: `6a8af49eaa3fb4a09a13e9943add32d1b1e987c89c2089ebb734f75b50dddc49`

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