PDF malware analysis — malicious · cabae8fa1d9b43be

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 11:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4a4e87b5569de5951a67e2f2368cbe65 SHA-1: 8826bc54c912d345dc469e4227674160031cd4bc SHA-256: cabae8fa1d9b43be402d198f73c377c11c2d354c72a9c801f98482aec0affcf8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond what the heuristics suggest.

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.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1be3d669---70166673998.pdf In PDF document text
- http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/42284913232.pdfIn PDF document text
- http://chameleoncoupons.com/adgprocessing/uploads/files/44375873599.pdfIn PDF document text
- http://sinproval.it/userfiles/files/vafupojizexodasegune.pdfIn PDF document text
- https://spitalmoldovanoua.ro/ckfinder/userfiles/files/topasuxepakuwojajutuzu.pdfIn PDF document text
- http://saktigroup.in/uploads/zavovap.pdfIn PDF document text
- https://lenaoyunlar.com/calisma2/files/uploads/91258811509.pdfIn PDF document text
- https://dzido.pl/userfiles/file/rebotaki.pdfIn PDF document text
- https://tunguoilon.tunhua.vn/ipp/images/uploads/files/20368914527.pdfIn PDF document text
- https://www.pepinieres-gey.fr/ckfinder/userfiles/files/malejew.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146d8e6e0d81---89985163283.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34919724771858f6ce072fd54f2d68be/baferobejalawazajobek.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16149189198e42---wabavawoki.pdfIn PDF document text
- http://resortcrimea.com/ckfinder/userfiles/files/bemiwiganuleroropapav.pdfIn PDF document text
- https://marjoyunlar.com/calisma2/files/uploads/91689369205.pdfIn PDF document text
- http://yejida.com/userfiles/file/19131910058.pdfIn PDF document text
- http://johnmarzillier.com/ckfinder/userfiles/files/68165006784.pdfIn PDF document text
- https://fwstc.in/userfiles/file/84866244081.pdfIn PDF document text
- https://www.jaegeraviation.com/ckfinder/userfiles/files/85231870919.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d720b41a8e3b12fb70bea81387554317/sodakuzubaruxowetuwe.pdfIn PDF document text
- http://nedirajtebosnu.net/userfiles/file/92390414215.pdfIn PDF document text
- http://jiuxingchaoshi.com/uploads/file/181150166026.pdfIn PDF document text
- http://robwalker.net/fckupload/file/68518526133.pdfIn PDF document text
- http://denetimmusavirlik.com/userfiles/file/12138525572.pdfIn PDF document text
- http://www.anaja-inter.org/public/file/futusiveruwe.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+screenshot+on+android+phonePDF 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_off0000d699.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD699	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eeab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEAB	17644 bytes
SHA-256: `d64be4fd459f1677267b6708323a22795c4d29583c95054da56992825b9cdc62`
`font_02_sfnt_off00011c5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C5E	10904 bytes
SHA-256: `ea75bf988d1117ce3a42e30d8198b6ae5a2fb00aa7fec95f5ba565d1bafed5de`

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