PDF malware analysis — malicious · dca33f9b58100cd5

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 11:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e8496f9239a169c05dac990ccfafad6d SHA-1: 3b53ebd6b0d78f3655393c8db10ffa926377bf5c SHA-256: dca33f9b58100cd539fdd0bebe7461f531d26885e972335e687025b57c84bb5e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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 https://smidgel.ru/uplcv?utm_term=are+androids+faster+than+iphones PDF link annotation
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f21ec496---62354907716.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/71678808200.pdfIn PDF document text
- https://takarasushimn.com/userfiles/files/fazupofimesamunipotimi.pdfIn PDF document text
- http://desiaussies.com/ckeditor/uploads/files/22584873227.pdfIn PDF document text
- http://meijialx.com/ckfinder/userfiles/files/dapexi.pdfIn PDF document text
- http://ned.ru/uploads/files/latujejilefolufo.pdfIn PDF document text
- http://usateatop.com/_upload/files/94316834150.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409534152e4---zonexapiten.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/06d0b223e255c7df879c59f016b4d0bc/rasopuwudunamizivip.pdfIn PDF document text
- https://suacuacuontoanphat.com/upload/files/68156713581.pdfIn PDF document text
- https://un7un9b3rl1pa7-99.com/contents/files/88239161625.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pnoapgjq6rgch78h78g4r19o86/vudetevoguped.pdfIn PDF document text
- https://polandpools.com/contents/files/96542643197.pdfIn PDF document text
- https://permargi.com/files/galeria/files/27478248561.pdfIn PDF document text
- https://onthespothousing.com/userfiles/file/25932640881.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e327502d6---60144158068.pdfIn PDF document text
- http://keyflounge.nl/userfiles/file/jefemokuwusoro.pdfIn PDF document text
- http://fapannimario.it/userfiles/files/16714650706.pdfIn PDF document text
- https://fptica.ru/images/file/julipuxowaveviga.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/visipaturojomo.pdfIn PDF document text
- http://www.parkwaytransplant.com/media_upload/upload/files/20201924662.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8e6f3eba---mexorapizevim.pdfIn PDF document text
- https://pilot-nav.com/ckfinder/userfiles/files/99325961165.pdfIn PDF document text
- https://familienbilstrup.dk/ckfinder/userfiles/files/tuxenomesoxipibafoneti.pdfIn PDF document text
- http://shengnabei.com/uploadfile/file///2021090901460954.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_off0000d8da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8DA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f0ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0EC	17252 bytes
SHA-256: `fc32976e4d2653e8426b37fb6a01f279b41ff08f59a643d9aea1092504b7b173`
`font_02_sfnt_off00011d7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D7C	10528 bytes
SHA-256: `21b05fc880721090c3a0032bdbbdc17aa2927bbf59fa1efc0006687ead3c452d`

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