PDF malware analysis — malicious · 0516586a282e3ed4

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 20:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 46472e9c65ac5c19f2bd25ece4506020 SHA-1: 9ac01a320763f82b7b4365a92dc624a629d6da51 SHA-256: 0516586a282e3ed49782b7b316db439610bbe2576ac42853e13e4a5ea9d409e4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm on disposable hosting indicates a probable phishing or malware distribution attempt.

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://laborke.ru/uplcv?utm_term=types+of+trees+in+discrete+mathematics PDF link annotation
- https://pakistanchristiancongress.org/userfiles/file/34357666188.pdfIn PDF document text
- http://physio-praxismitte.de/userfiles/sekij.pdfIn PDF document text
- https://penzion-pod-rozhlednou.cz/img/file/4930127684.pdfIn PDF document text
- http://jnnycc.org/userfiles/file/jerepudomijufuzipove.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/h95o995d7p9na2vrpi1l931bu9/85043445140.pdfIn PDF document text
- http://bwemfjhjk.friend-match.com/upload/files/51740703099.pdfIn PDF document text
- https://oriental-kitchens.com/userfiles/files/94290203098.pdfIn PDF document text
- https://keluargamimpi.com/contents/files/95774611364.pdfIn PDF document text
- http://xatrbio.com/userfiles/file/92490042647.pdfIn PDF document text
- https://tekstilkentrehber.com/upload/ckfinder/files/74016499710.pdfIn PDF document text
- https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/ruzupuvidalun.pdfIn PDF document text
- http://hhoasis.org/app/webroot/img/fck/file/wabazaxategaxivejezanaja.pdfIn PDF document text
- https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613726541b8cc---67953577670.pdfIn PDF document text
- http://savaksangida.com/resimler/files/40152778625.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f79f89a40082f8fc50f65a736584f0a6/30772629252.pdfIn PDF document text
- http://sportingfoundation.com/uploads/file/45993235895.pdfIn PDF document text
- https://optimuselearningschool.com/learning/site/images/uploadfiles/8811893103.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/forewevubagazelo.pdfIn PDF document text
- http://uchid.com/uploads/file/fasomexifurifego.pdfIn PDF document text
- https://ecableapp.com/FCKeditor/FCKimgUpload/file/jisofetifabisopapam.pdfIn PDF document text
- http://jarauwerdaenzn.nl/userfiles/file/52178116832.pdfIn PDF document text
- https://agape4u.org/userfiles/file/nonenipetivuzutu.pdfIn PDF document text
- https://csodamalom.hu/files/files/41318848265.pdfIn PDF document text
- http://i-physiology.ru/upload/43256999347.pdfIn PDF document text
- https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.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_off0000cc69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC69	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e47b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE47B	18028 bytes
SHA-256: `ad724f501dabdf0534a315d0176a3b5473b95131ffb17edd7e51b2ad656375ce`
`font_02_sfnt_off00011403.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11403	10916 bytes
SHA-256: `a7486879b4bc0a44d0fbd8c16b4947150d883119445bec04e6c6f58b24283eb3`

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